Loading…
The 1998 season’s official transaction log: 969 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 31, 1998 | Signed as free agent | Thomas Howard | — | St. Louis Cardinals | Free agent signing |
| Dec 30, 1998 | Signed as free agent | Pedro Borbon | — | Los Angeles Dodgers | Free agent signing |
| Dec 30, 1998 | Signed as free agent | John Mabry | — | Seattle Mariners | Free agent signing |
| Dec 29, 1998 | Signed as free agent | David Manning | — | Chicago Cubs | Free agent signing |
| Dec 29, 1998 | Signed as free agent | Luis Pineda | — | Detroit Tigers | Free agent signing |
| Dec 28, 1998 | Signed as free agent | Gregg Jefferies | — | Detroit Tigers | Free agent signing |
| Dec 28, 1998 | Trade | Luis Gonzalez | Detroit Tigers | Arizona Diamondbacks | Trade |
| Dec 28, 1998 | Trade | Karim Garcia | Arizona Diamondbacks | Detroit Tigers | Trade |
| Dec 27, 1998 | Signed as free agent | Carlos Garcia | — | San Diego Padres | Free agent signing |
| Dec 23, 1998 | Signed as free agent | Tim Belcher | — | Anaheim Angels | Free agent signing |
| Dec 23, 1998 | Signed as free agent | Rob Butler | — | Toronto Blue Jays | Free agent signing |
| Dec 23, 1998 | Signed as free agent | Giovanni Carrara | — | Cincinnati Reds | Free agent signing |
| Dec 23, 1998 | Signed as free agent | Domingo Cedeno | — | Oakland Athletics | Free agent signing |
| Dec 23, 1998 | Signed as free agent | Mike Garcia | — | Pittsburgh Pirates | Free agent signing |
| Dec 23, 1998 | Signed as free agent | Mark Lewis | — | Cincinnati Reds | Free agent signing |
| Dec 23, 1998 | Signed as free agent | Mike Matheny | — | Toronto Blue Jays | Free agent signing |
| Dec 23, 1998 | Signed as free agent | F. P. Santangelo | — | San Francisco Giants | Free agent signing |
| Dec 22, 1998 | Signed as free agent | Rafael Bournigal | — | Pittsburgh Pirates | Free agent signing |
| Dec 22, 1998 | Signed as free agent | Ivan Cruz | — | Pittsburgh Pirates | Free agent signing |
| Dec 22, 1998 | Signed as free agent | Jim Dougherty | — | Pittsburgh Pirates | Free agent signing |
| Dec 22, 1998 | Signed as free agent | Rob Ducey | — | Philadelphia Phillies | Free agent signing |
| Dec 22, 1998 | Released | Mark Johnson | Anaheim Angels | — | Release |
| Dec 22, 1998 | Signed as free agent | Ray Montgomery | — | Pittsburgh Pirates | Free agent signing |
| Dec 22, 1998 | Signed as free agent | John Riedling | — | Cincinnati Reds | Free agent signing |
| Dec 22, 1998 | Signed as free agent | Todd Ritchie | — | Pittsburgh Pirates | Free agent signing |
| Dec 22, 1998 | Signed as free agent | Chris Tremie | — | Pittsburgh Pirates | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Rich Amaral | — | Baltimore Orioles | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Steve Avery | — | Cincinnati Reds | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Brian Bevil | — | Kansas City Royals | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Ricky Bones | — | Baltimore Orioles | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Chris Clapinski | — | Florida Marlins | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Jesse Garcia | — | Baltimore Orioles | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Chris Hatcher | — | Colorado Rockies | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Dave Magadan | — | San Diego Padres | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Pat Mahomes | — | New York Mets | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Alvin Morman | — | Kansas City Royals | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Ken Ryan | — | Philadelphia Phillies | Free agent signing |
| Dec 21, 1998 | Signed as free agent | Don Wengert | — | Kansas City Royals | Free agent signing |
| Dec 21, 1998 | Signed as free agent | George Williams | — | Minnesota Twins | Free agent signing |
| Dec 21, 1998 | Trade | Troy Brohawn | San Francisco Giants | Arizona Diamondbacks | Trade |
| Dec 21, 1998 | Trade | Chris Van Rossum | San Francisco Giants | Arizona Diamondbacks | Trade |
| Dec 20, 1998 | Signed | Arnie Munoz | — | Chicago White Sox | Amateur free agent signing |
| Dec 19, 1998 | Signed as free agent | Hector Almonte | — | Florida Marlins | Free agent signing |
| Dec 19, 1998 | Signed as free agent | Mark Guthrie | — | Boston Red Sox | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Jeff Barry | — | Colorado Rockies | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Henry Blanco | — | Colorado Rockies | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Toby Borland | — | Anaheim Angels | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Frank Charles | — | San Diego Padres | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Brian Daubach | — | Boston Red Sox | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Steve Finley | — | Arizona Diamondbacks | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Mark Hutton | — | Tampa Bay Devil Rays | Free agent signing |
| Dec 18, 1998 | Released | Tim Laker | Pittsburgh Pirates | — | Release |
| Dec 18, 1998 | Signed as free agent | Jesse Levis | — | Tampa Bay Devil Rays | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Shane Mack | — | San Diego Padres | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Josias Manzanillo | — | New York Mets | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Dave McCarty | — | Detroit Tigers | Free agent signing |
| Dec 18, 1998 | Released | Marc Newfield | Milwaukee Brewers | — | Release |
| Dec 18, 1998 | Signed as free agent | Craig Paquette | — | New York Mets | Free agent signing |
| Dec 18, 1998 | Signed as free agent | J. R. Phillips | — | Colorado Rockies | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Luis Polonia | — | Detroit Tigers | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Tom Prince | — | Philadelphia Phillies | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Gary Rath | — | Minnesota Twins | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Pete Schourek | — | Pittsburgh Pirates | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Terry Shumpert | — | Colorado Rockies | Free agent signing |
| Dec 18, 1998 | Signed as free agent | Jim Tatum | — | Colorado Rockies | Free agent signing |
| Dec 18, 1998 | Trade | Matt Garrick | Anaheim Angels | St. Louis Cardinals | Trade |
| Dec 17, 1998 | Signed as free agent | Dan Carlson | — | Arizona Diamondbacks | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Erik Hanson | — | Kansas City Royals | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Xavier Hernandez | — | Baltimore Orioles | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Ray Holbert | — | Kansas City Royals | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Pete Incaviglia | — | Arizona Diamondbacks | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Keith Johnson | — | Arizona Diamondbacks | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Rick Krivda | — | Kansas City Royals | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Scott Leius | — | Kansas City Royals | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Doug Linton | — | Baltimore Orioles | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Kirt Manwaring | — | Colorado Rockies | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Matt Mieske | — | Seattle Mariners | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Chad Mottola | — | Chicago White Sox | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Ricky Pickett | — | Kansas City Royals | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Jim Poole | — | Philadelphia Phillies | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Scott Pose | — | Kansas City Royals | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Matt Ruebel | — | Arizona Diamondbacks | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Joe Slusarski | — | Houston Astros | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Kennie Steenstra | — | Kansas City Royals | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Pedro Swann | — | Detroit Tigers | Free agent signing |
| Dec 17, 1998 | Signed as free agent | Joe Vitiello | — | Kansas City Royals | Free agent signing |
| Dec 16, 1998 | Signed as free agent | Bubba Carpenter | — | New York Yankees | Free agent signing |
| Dec 16, 1998 | Signed as free agent | Rickey Henderson | — | New York Mets | Free agent signing |
| Dec 16, 1998 | Signed as free agent | Phil Hiatt | — | Cincinnati Reds | Free agent signing |
| Dec 16, 1998 | Signed as free agent | Marc Kroon | — | Seattle Mariners | Free agent signing |
| Dec 16, 1998 | Signed as free agent | Mike Macfarlane | — | Oakland Athletics | Free agent signing |
| Dec 16, 1998 | Signed as free agent | Walt McKeel | — | Toronto Blue Jays | Free agent signing |
| Dec 16, 1998 | Released | Jose Mercedes | Milwaukee Brewers | — | Release |
| Dec 16, 1998 | Signed as free agent | Ed Sprague | — | Pittsburgh Pirates | Free agent signing |
| Dec 15, 1998 | Signed as free agent | D. T. Cromer | — | Cincinnati Reds | Free agent signing |
| Dec 15, 1998 | Signed as free agent | Alejandro Freire | — | Detroit Tigers | Free agent signing |
| Dec 15, 1998 | Signed as free agent | Brent Gates | — | Minnesota Twins | Free agent signing |
| Dec 15, 1998 | Signed as free agent | Jason Hardtke | — | Cincinnati Reds | Free agent signing |
| Dec 15, 1998 | Signed as free agent | Damon Hollins | — | Cincinnati Reds | Free agent signing |
| Dec 15, 1998 | Signed as free agent | Chad Kreuter | — | Kansas City Royals | Free agent signing |
| Dec 15, 1998 | Signed as free agent | Chris Nichting | — | New York Yankees | Free agent signing |
| Dec 15, 1998 | Signed as free agent | Melvin Nieves | — | Minnesota Twins | Free agent signing |
| Dec 15, 1998 | Signed as free agent | Mark Thompson | — | Cincinnati Reds | Free agent signing |
| Dec 15, 1998 | Signed as free agent | Eddie Williams | — | Minnesota Twins | Free agent signing |
| Dec 15, 1998 | Trade | Bart Miadich | Boston Red Sox | Arizona Diamondbacks | Trade |
| Dec 15, 1998 | Trade | Darrell Nicholas | Milwaukee Brewers | Minnesota Twins | Trade |
| Dec 14, 1998 | Released | Paul Abbott | Seattle Mariners | — | Release |
| Dec 14, 1998 | Signed as free agent | Israel Alcantara | — | Boston Red Sox | Free agent signing |
| Dec 14, 1998 | Signed as free agent | Geronimo Berroa | — | Toronto Blue Jays | Free agent signing |
| Dec 14, 1998 | Released | Rafael Bournigal | Oakland Athletics | — | Release |
| Dec 14, 1998 | Signed as free agent | Kirk Bullinger | — | Boston Red Sox | Free agent signing |
| Dec 14, 1998 | Signed as free agent | Brad Clontz | — | Boston Red Sox | Free agent signing |
| Dec 14, 1998 | Signed as free agent | Todd Haney | — | New York Mets | Free agent signing |
| Dec 14, 1998 | Signed as free agent | Tim Harikkala | — | Boston Red Sox | Free agent signing |
| Dec 14, 1998 | Signed as free agent | Bill Haselman | — | Detroit Tigers | Free agent signing |
| Dec 14, 1998 | Signed as free agent | Tom Lampkin | — | Seattle Mariners | Free agent signing |
| Dec 14, 1998 | Released | Miguel Ojeda | Pittsburgh Pirates | — | Release |
| Dec 14, 1998 | Released | Eduardo Perez | Cincinnati Reds | — | Release |
| Dec 14, 1998 | Signed as free agent | Tony Phillips | — | Oakland Athletics | Free agent signing |
| Dec 14, 1998 | Released | Brady Raggio | St. Louis Cardinals | — | Release |
| Dec 14, 1998 | Released | Carlos Reyes | Boston Red Sox | — | Release |
| Dec 14, 1998 | Released | John Riedling | Cincinnati Reds | — | Release |
| Dec 14, 1998 | Trade | Alex Ochoa | Minnesota Twins | Milwaukee Brewers | Trade |
| Dec 14, 1998 | Trade | Beiker Graterol | Toronto Blue Jays | Detroit Tigers | Trade |
| Dec 14, 1998 | Trade | Eric Ludwick | Detroit Tigers | Toronto Blue Jays | Trade |
| Dec 14, 1998 | Trade | Armando Almanza | St. Louis Cardinals | Florida Marlins | Trade |
| Dec 14, 1998 | Trade | Braden Looper | St. Louis Cardinals | Florida Marlins | Trade |
| Dec 14, 1998 | Trade | Pablo Ozuna | St. Louis Cardinals | Florida Marlins | Trade |
| Dec 14, 1998 | Trade | Edgar Renteria | Florida Marlins | St. Louis Cardinals | Trade |
| Dec 14, 1998 | Trade | Jon Lieber | Pittsburgh Pirates | Chicago Cubs | Trade |
| Dec 14, 1998 | Trade | Brant Brown | Chicago Cubs | Pittsburgh Pirates | Trade |
| Dec 14, 1998 | Trade | Leslie Brea | Seattle Mariners | New York Mets | Trade |
| Dec 14, 1998 | Trade | Butch Huskey | New York Mets | Seattle Mariners | Trade |
| Dec 14, 1998 | Trade | Mark Petkovsek | St. Louis Cardinals | Anaheim Angels | Trade |
| Dec 12, 1998 | Signed as free agent | Kevin Brown | — | Los Angeles Dodgers | Free agent signing |
| Dec 12, 1998 | Trade | Carlos Almanzar | Toronto Blue Jays | San Diego Padres | Trade |
| Dec 12, 1998 | Trade | Woody Williams | Toronto Blue Jays | San Diego Padres | Trade |
| Dec 12, 1998 | Trade | Pete Tucci | Toronto Blue Jays | San Diego Padres | Trade |
| Dec 12, 1998 | Trade | Joey Hamilton | San Diego Padres | Toronto Blue Jays | Trade |
| Dec 11, 1998 | Signed as free agent | Joel Adamson | — | Oakland Athletics | Free agent signing |
| Dec 11, 1998 | Released | Trey Beamon | Detroit Tigers | — | Release |
| Dec 11, 1998 | Released | Rich Becker | Baltimore Orioles | — | Release |
| Dec 11, 1998 | Signed as free agent | Jose Canseco | — | Tampa Bay Devil Rays | Free agent signing |
| Dec 11, 1998 | Released | Domingo Cedeno | Texas Rangers | — | Release |
| Dec 11, 1998 | Signed as free agent | Luis Ortiz | — | Milwaukee Brewers | Free agent signing |
| Dec 11, 1998 | Signed as free agent | Mark Portugal | — | Boston Red Sox | Free agent signing |
| Dec 11, 1998 | Signed as free agent | Rey Sanchez | — | Kansas City Royals | Free agent signing |
| Dec 11, 1998 | Signed as free agent | Mo Vaughn | — | Anaheim Angels | Free agent signing |
| Dec 11, 1998 | Signed as free agent | Eddie Zosky | — | Milwaukee Brewers | Free agent signing |
| Dec 10, 1998 | Signed as free agent | Sean Berry | — | Milwaukee Brewers | Free agent signing |
| Dec 10, 1998 | Signed as free agent | Mark Clark | — | Texas Rangers | Free agent signing |
| Dec 10, 1998 | Signed as free agent | Randy Johnson | — | Arizona Diamondbacks | Free agent signing |
| Dec 10, 1998 | Signed as free agent | Alan Mills | — | Los Angeles Dodgers | Free agent signing |
| Dec 10, 1998 | Signed as free agent | Eric Owens | — | San Diego Padres | Free agent signing |
| Dec 10, 1998 | Trade | Juan LeBron | Kansas City Royals | New York Mets | Trade |
| Dec 10, 1998 | Trade | Joe Randa | New York Mets | Kansas City Royals | Trade |
| Dec 9, 1998 | Signed as free agent | Rich Robertson | — | Texas Rangers | Free agent signing |
| Dec 9, 1998 | Signed as free agent | Benito Santiago | — | Chicago Cubs | Free agent signing |
| Dec 9, 1998 | Released | Derrick White | Colorado Rockies | — | Release |
| Dec 8, 1998 | Released | Matt Mieske | Chicago Cubs | — | Release |
| Dec 8, 1998 | Released | Pedro Valdes | Chicago Cubs | — | Release |
| Dec 8, 1998 | Signed as free agent | Mark Whiten | — | Cleveland Indians | Free agent signing |
| Dec 8, 1998 | Trade | Chris Singleton | New York Yankees | Chicago White Sox | Trade |
| Dec 8, 1998 | Trade | Felix Rodriguez | Arizona Diamondbacks | San Francisco Giants | Trade |
| Dec 7, 1998 | Signed as free agent | Tim Bogar | — | Houston Astros | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Billy Brewer | — | Philadelphia Phillies | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Will Clark | — | Baltimore Orioles | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Delino DeShields | — | Baltimore Orioles | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Gary Gaetti | — | Chicago Cubs | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Glenallen Hill | — | Chicago Cubs | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Pat Kelly | — | St. Louis Cardinals | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Jack McDowell | — | Anaheim Angels | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Willie McGee | — | St. Louis Cardinals | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Jeff Montgomery | — | Kansas City Royals | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Craig Shipley | — | Anaheim Angels | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Dave Stieb | — | Toronto Blue Jays | Free agent signing |
| Dec 7, 1998 | Signed as free agent | B. J. Surhoff | — | Baltimore Orioles | Free agent signing |
| Dec 7, 1998 | Signed as free agent | Randy Velarde | — | Anaheim Angels | Free agent signing |
| Dec 5, 1998 | Signed as free agent | Graham Koonce | — | San Diego Padres | Free agent signing |
| Dec 4, 1998 | Signed as free agent | Greg Hansell | — | San Francisco Giants | Free agent signing |
| Dec 4, 1998 | Signed as free agent | Reggie Harris | — | Milwaukee Brewers | Free agent signing |
| Dec 4, 1998 | Signed as free agent | Rafael Palmeiro | — | Texas Rangers | Free agent signing |
| Dec 4, 1998 | Signed as free agent | Bronswell Patrick | — | San Francisco Giants | Free agent signing |
| Dec 4, 1998 | Signed | Carlos Ruiz | — | Philadelphia Phillies | Amateur free agent signing |
| Dec 4, 1998 | Trade | Joe Randa | Detroit Tigers | New York Mets | Trade |
| Dec 4, 1998 | Trade | Willie Blair | New York Mets | Detroit Tigers | Trade |
| Dec 2, 1998 | Signed as free agent | Royce Clayton | — | Texas Rangers | Free agent signing |
| Dec 2, 1998 | Signed as free agent | Ozzie Guillen | — | Atlanta Braves | Free agent signing |
| Dec 2, 1998 | Signed as free agent | Carlos Hernandez | — | San Diego Padres | Free agent signing |
| Dec 2, 1998 | Signed as free agent | Mike Hubbard | — | Texas Rangers | Free agent signing |
| Dec 2, 1998 | Signed as free agent | Armando Reynoso | — | Arizona Diamondbacks | Free agent signing |
| Dec 2, 1998 | Signed as free agent | Henry Rodriguez | — | Chicago Cubs | Free agent signing |
| Dec 2, 1998 | Signed as free agent | Scott Sanders | — | Chicago Cubs | Free agent signing |
| Dec 2, 1998 | Released | Dave Stevens | Chicago Cubs | — | Release |
| Dec 2, 1998 | Signed as free agent | Todd Stottlemyre | — | Arizona Diamondbacks | Free agent signing |
| Dec 2, 1998 | Signed as free agent | Ernie Young | — | Arizona Diamondbacks | Free agent signing |
| Dec 2, 1998 | Trade | Manuel Barrios | Florida Marlins | Cincinnati Reds | Trade |
| Dec 2, 1998 | Trade | Guillermo Garcia | Cincinnati Reds | Florida Marlins | Trade |
| Dec 1, 1998 | Signed as free agent | Roberto Alomar | — | Cleveland Indians | Free agent signing |
| Dec 1, 1998 | Signed as free agent | Albert Belle | — | Baltimore Orioles | Free agent signing |
| Dec 1, 1998 | Signed as free agent | Otis Nixon | — | Atlanta Braves | Free agent signing |
| Dec 1, 1998 | Released | Curtis Pride | Atlanta Braves | — | Release |
| Dec 1, 1998 | Signed as free agent | Robin Ventura | — | New York Mets | Free agent signing |
| Dec 1, 1998 | Trade | Roger Cedeno | Los Angeles Dodgers | New York Mets | Trade |
| Dec 1, 1998 | Trade | Charles Johnson | Los Angeles Dodgers | New York Mets | Trade |
| Dec 1, 1998 | Trade | Todd Hundley | New York Mets | Los Angeles Dodgers | Trade |
| Dec 1, 1998 | Trade | Arnie Gooch | New York Mets | Los Angeles Dodgers | Trade |
| Dec 1, 1998 | Trade | Armando Benitez | Baltimore Orioles | New York Mets | Trade |
| Dec 1, 1998 | Trade | Charles Johnson | New York Mets | Baltimore Orioles | Trade |
| Nov 28, 1998 | Signed as free agent | Dave Eiland | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 28, 1998 | Signed as free agent | Tony Fiore | — | Philadelphia Phillies | Free agent signing |
| Nov 25, 1998 | Released | P. J. Forbes | Baltimore Orioles | — | Release |
| Nov 25, 1998 | Signed as free agent | Dave Silvestri | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 25, 1998 | Signed as free agent | Bernie Williams | — | New York Yankees | Free agent signing |
| Nov 24, 1998 | Signed as free agent | Rickey Cradle | — | Detroit Tigers | Free agent signing |
| Nov 24, 1998 | Signed as free agent | Nelson Cruz | — | Detroit Tigers | Free agent signing |
| Nov 24, 1998 | Signed as free agent | Aaron Holbert | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 24, 1998 | Signed as free agent | Felipe Lira | — | Detroit Tigers | Free agent signing |
| Nov 24, 1998 | Signed as free agent | Juan Moreno | — | Texas Rangers | Free agent signing |
| Nov 24, 1998 | Signed as free agent | Joe Siddall | — | Detroit Tigers | Free agent signing |
| Nov 24, 1998 | Signed | Rob Tejeda | — | Philadelphia Phillies | Amateur free agent signing |
| Nov 23, 1998 | Released | Billy Ashley | Boston Red Sox | — | Release |
| Nov 23, 1998 | Released | Rich Garces | Boston Red Sox | — | Release |
| Nov 23, 1998 | Signed as free agent | Dean Hartgraves | — | San Diego Padres | Free agent signing |
| Nov 23, 1998 | Signed as free agent | Brian Jordan | — | Atlanta Braves | Free agent signing |
| Nov 23, 1998 | Signed as free agent | Scott Radinsky | — | St. Louis Cardinals | Free agent signing |
| Nov 23, 1998 | Signed as free agent | Roberto Rivera | — | San Diego Padres | Free agent signing |
| Nov 23, 1998 | Signed as free agent | Tanyon Sturtze | — | Chicago White Sox | Free agent signing |
| Nov 23, 1998 | Signed as free agent | Tom Wilson | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 22, 1998 | Signed as free agent | Butch Henry | — | Seattle Mariners | Free agent signing |
| Nov 22, 1998 | Released | Damon Hollins | Los Angeles Dodgers | — | Release |
| Nov 20, 1998 | Released | Jason Bates | Colorado Rockies | — | Release |
| Nov 20, 1998 | Signed as free agent | Miguel Del Toro | — | San Francisco Giants | Free agent signing |
| Nov 20, 1998 | Signed as free agent | Hector Ramirez | — | Milwaukee Brewers | Free agent signing |
| Nov 20, 1998 | Released | Carlos Valdez | Boston Red Sox | — | Release |
| Nov 20, 1998 | Trade | Oscar Henriquez | Florida Marlins | New York Mets | Trade |
| Nov 20, 1998 | Trade | Jorge Fabregas | New York Mets | Florida Marlins | Trade |
| Nov 19, 1998 | Signed as free agent | Larry Casian | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 19, 1998 | Released | Brian Daubach | Florida Marlins | — | Release |
| Nov 19, 1998 | Signed as free agent | Eric Davis | — | St. Louis Cardinals | Free agent signing |
| Nov 19, 1998 | Signed as free agent | Terrell Lowery | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 19, 1998 | Signed as free agent | Bobby Munoz | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 19, 1998 | Signed as free agent | Alan Newman | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 19, 1998 | Signed as free agent | Chris Seelbach | — | Atlanta Braves | Free agent signing |
| Nov 19, 1998 | Released | Bob Wells | Seattle Mariners | — | Release |
| Nov 19, 1998 | Trade | Jeff Brantley | St. Louis Cardinals | Philadelphia Phillies | Trade |
| Nov 19, 1998 | Trade | Ron Gant | St. Louis Cardinals | Philadelphia Phillies | Trade |
| Nov 19, 1998 | Trade | Cliff Politte | St. Louis Cardinals | Philadelphia Phillies | Trade |
| Nov 19, 1998 | Trade | Ricky Bottalico | Philadelphia Phillies | St. Louis Cardinals | Trade |
| Nov 19, 1998 | Trade | Garrett Stephenson | Philadelphia Phillies | St. Louis Cardinals | Trade |
| Nov 18, 1998 | Signed as free agent | Dennis Cook | — | New York Mets | Free agent signing |
| Nov 18, 1998 | Signed as free agent | Reid Cornelius | — | Anaheim Angels | Free agent signing |
| Nov 18, 1998 | Signed as free agent | Steve Decker | — | Anaheim Angels | Free agent signing |
| Nov 18, 1998 | Signed as free agent | Alex Delgado | — | Toronto Blue Jays | Free agent signing |
| Nov 18, 1998 | Signed as free agent | Mike Fyhrie | — | Anaheim Angels | Free agent signing |
| Nov 18, 1998 | Signed as free agent | Jeff Huson | — | Anaheim Angels | Free agent signing |
| Nov 18, 1998 | Signed as free agent | Andy Tomberlin | — | New York Mets | Free agent signing |
| Nov 18, 1998 | Signed as free agent | Darrin Winston | — | Anaheim Angels | Free agent signing |
| Nov 18, 1998 | Released | Shannon Withem | Toronto Blue Jays | — | Release |
| Nov 18, 1998 | Trade | Brian Giles | Cleveland Indians | Pittsburgh Pirates | Trade |
| Nov 18, 1998 | Trade | Ricardo Rincon | Pittsburgh Pirates | Cleveland Indians | Trade |
| Nov 17, 1998 | Signed as free agent | Mike Benjamin | — | Pittsburgh Pirates | Free agent signing |
| Nov 17, 1998 | Signed as free agent | Jeff Branson | — | Cincinnati Reds | Free agent signing |
| Nov 17, 1998 | Signed as free agent | Melvin Bunch | — | Seattle Mariners | Free agent signing |
| Nov 17, 1998 | Signed as free agent | Ken Caminiti | — | Houston Astros | Free agent signing |
| Nov 17, 1998 | Released | Archi Cianfrocco | San Diego Padres | — | Release |
| Nov 17, 1998 | Signed as free agent | Greg Colbrunn | — | Arizona Diamondbacks | Free agent signing |
| Nov 17, 1998 | Signed as free agent | Mike Coolbaugh | — | New York Yankees | Free agent signing |
| Nov 17, 1998 | Signed as free agent | Archie Corbin | — | Florida Marlins | Free agent signing |
| Nov 17, 1998 | Signed as free agent | Kevin Foster | — | Cincinnati Reds | Free agent signing |
| Nov 17, 1998 | Signed as free agent | Brandon Puffer | — | Cincinnati Reds | Free agent signing |
| Nov 17, 1998 | Signed as free agent | Joe Roa | — | Kansas City Royals | Free agent signing |
| Nov 17, 1998 | Released | Scott Sanders | San Diego Padres | — | Release |
| Nov 16, 1998 | Signed as free agent | Raul Gonzalez | — | Boston Red Sox | Free agent signing |
| Nov 16, 1998 | Released | Jeff Juden | Anaheim Angels | — | Release |
| Nov 16, 1998 | Signed as free agent | Jose Offerman | — | Boston Red Sox | Free agent signing |
| Nov 16, 1998 | Released | Rich Robertson | Anaheim Angels | — | Release |
| Nov 16, 1998 | Signed as free agent | Mike Timlin | — | Baltimore Orioles | Free agent signing |
| Nov 16, 1998 | Signed as free agent | Matt Whiteside | — | San Diego Padres | Free agent signing |
| Nov 16, 1998 | Trade | Allen Butler | New York Yankees | Minnesota Twins | Trade |
| Nov 16, 1998 | Trade | Dan Naulty | Minnesota Twins | New York Yankees | Trade |
| Nov 13, 1998 | Signed as free agent | Ellis Burks | — | San Francisco Giants | Free agent signing |
| Nov 13, 1998 | Signed as free agent | Chris Coste | — | Pittsburgh Pirates | Free agent signing with first major-league team |
| Nov 13, 1998 | Signed as free agent | Steve Gajkowski | — | Chicago Cubs | Free agent signing |
| Nov 13, 1998 | Signed as free agent | Andrew Lorraine | — | Chicago Cubs | Free agent signing |
| Nov 13, 1998 | Signed as free agent | Jose Mesa | — | Seattle Mariners | Free agent signing |
| Nov 13, 1998 | Signed as free agent | Dean Palmer | — | Detroit Tigers | Free agent signing |
| Nov 13, 1998 | Signed as free agent | Olmedo Saenz | — | Oakland Athletics | Free agent signing |
| Nov 13, 1998 | Signed as free agent | Scott Stahoviak | — | Chicago Cubs | Free agent signing |
| Nov 13, 1998 | Signed as free agent | Greg Swindell | — | Arizona Diamondbacks | Free agent signing |
| Nov 13, 1998 | Signed as free agent | John Vander Wal | — | San Diego Padres | Free agent signing |
| Nov 13, 1998 | Trade | Chad Ogea | Cleveland Indians | Philadelphia Phillies | Trade |
| Nov 13, 1998 | Trade | Jerry Spradlin | Philadelphia Phillies | Cleveland Indians | Trade |
| Nov 12, 1998 | Signed as free agent | Larry Luebbers | — | St. Louis Cardinals | Free agent signing |
| Nov 12, 1998 | Signed as free agent | DaRond Stovall | — | Florida Marlins | Free agent signing |
| Nov 12, 1998 | Signed as free agent | Alan Zinter | — | Chicago Cubs | Free agent signing |
| Nov 11, 1998 | Signed as free agent | David Cone | — | New York Yankees | Free agent signing |
| Nov 11, 1998 | Released | Bob Hamelin | Milwaukee Brewers | — | Release |
| Nov 11, 1998 | Signed as free agent | Rich Sauveur | — | Pittsburgh Pirates | Free agent signing |
| Nov 11, 1998 | Signed as free agent | Brian Shouse | — | Arizona Diamondbacks | Free agent signing |
| Nov 11, 1998 | Trade | Bob Wolcott | Arizona Diamondbacks | Boston Red Sox | Trade |
| Nov 11, 1998 | Trade | Mike Cameron | Chicago White Sox | Cincinnati Reds | Trade |
| Nov 11, 1998 | Trade | Paul Konerko | Cincinnati Reds | Chicago White Sox | Trade |
| Nov 11, 1998 | Trade | Mel Rojas | New York Mets | Los Angeles Dodgers | Trade |
| Nov 11, 1998 | Trade | Bobby Bonilla | Los Angeles Dodgers | New York Mets | Trade |
| Nov 10, 1998 | Signed as free agent | Scott Brosius | — | New York Yankees | Free agent signing |
| Nov 10, 1998 | Released | Rick Krivda | Cincinnati Reds | — | Release |
| Nov 10, 1998 | Signed | Pedro Liriano | — | Anaheim Angels | Amateur free agent signing |
| Nov 10, 1998 | Released | Tony Tarasco | Cincinnati Reds | — | Release |
| Nov 10, 1998 | Trade | Bret Boone | Cincinnati Reds | Atlanta Braves | Trade |
| Nov 10, 1998 | Trade | Mike Remlinger | Cincinnati Reds | Atlanta Braves | Trade |
| Nov 10, 1998 | Trade | Rob Bell | Atlanta Braves | Cincinnati Reds | Trade |
| Nov 10, 1998 | Trade | Denny Neagle | Atlanta Braves | Cincinnati Reds | Trade |
| Nov 10, 1998 | Trade | Michael Tucker | Atlanta Braves | Cincinnati Reds | Trade |
| Nov 10, 1998 | Trade | Dante Powell | San Francisco Giants | Arizona Diamondbacks | Trade |
| Nov 10, 1998 | Trade | Alan Embree | Arizona Diamondbacks | San Francisco Giants | Trade |
| Nov 9, 1998 | Signed as free agent | Brian Bohanon | — | Colorado Rockies | Free agent signing |
| Nov 9, 1998 | Signed as free agent | Darryl Hamilton | — | Colorado Rockies | Free agent signing |
| Nov 9, 1998 | Signed as free agent | Lenny Harris | — | Colorado Rockies | Free agent signing |
| Nov 9, 1998 | Signed as free agent | Devon White | — | Los Angeles Dodgers | Free agent signing |
| Nov 9, 1998 | Trade | Paul Spoljaric | Seattle Mariners | Philadelphia Phillies | Trade |
| Nov 9, 1998 | Trade | Mark Leiter | Philadelphia Phillies | Seattle Mariners | Trade |
| Nov 7, 1998 | Signed as free agent | Mark Langston | — | San Diego Padres | Free agent signing |
| Nov 6, 1998 | Released | Brent Brede | Arizona Diamondbacks | — | Release |
| Nov 6, 1998 | Signed | Oscar Villarreal | — | Arizona Diamondbacks | Amateur free agent signing |
| Nov 5, 1998 | Signed as free agent | Joel Bennett | — | Philadelphia Phillies | Free agent signing |
| Nov 5, 1998 | Signed as free agent | Alberto Castillo | — | Philadelphia Phillies | Free agent signing |
| Nov 5, 1998 | Signed as free agent | Steve Falteisek | — | Milwaukee Brewers | Free agent signing |
| Nov 5, 1998 | Signed as free agent | Lou Frazier | — | Philadelphia Phillies | Free agent signing |
| Nov 5, 1998 | Signed | Yoel Hernandez | — | Philadelphia Phillies | Amateur free agent signing |
| Nov 5, 1998 | Signed as free agent | Darren Lewis | — | Boston Red Sox | Free agent signing |
| Nov 5, 1998 | Signed as free agent | Torey Lovullo | — | Philadelphia Phillies | Free agent signing |
| Nov 5, 1998 | Signed as free agent | Steve Montgomery | — | Philadelphia Phillies | Free agent signing |
| Nov 5, 1998 | Signed as free agent | Terry Mulholland | — | Chicago Cubs | Free agent signing |
| Nov 5, 1998 | Released | Melvin Nieves | Cincinnati Reds | — | Release |
| Nov 5, 1998 | Signed as free agent | Steve Schrenk | — | Philadelphia Phillies | Free agent signing |
| Nov 4, 1998 | Signed as free agent | Creighton Gubanich | — | Boston Red Sox | Free agent signing |
| Nov 4, 1998 | Signed as free agent | Matt Miller | — | Texas Rangers | Free agent signing |
| Nov 3, 1998 | Signed as free agent | Chris Petersen | — | Colorado Rockies | Free agent signing |
| Nov 3, 1998 | Released | Dennis Springer | Tampa Bay Devil Rays | — | Release |
| Nov 3, 1998 | Trade | Scott Downs | Chicago Cubs | Minnesota Twins | Trade |
| Oct 31, 1998 | Signed | Armando Galarraga | — | Montreal Expos | Amateur free agent signing |
| Oct 30, 1998 | Signed | Angel Chavez | — | San Francisco Giants | Amateur free agent signing |
| Oct 30, 1998 | Signed | Enrique Gonzalez | — | Arizona Diamondbacks | Amateur free agent signing |
| Oct 30, 1998 | Signed as free agent | Rico Rossy | — | Kansas City Royals | Free agent signing |
| Oct 30, 1998 | Signed as free agent | Ben Weber | — | San Francisco Giants | Free agent signing |
| Oct 29, 1998 | Signed as free agent | Roberto Ramirez | — | Colorado Rockies | Free agent signing |
| Oct 29, 1998 | Trade | Walt White | Florida Marlins | Arizona Diamondbacks | Trade |
| Oct 29, 1998 | Trade | Kevin Burford | San Diego Padres | Colorado Rockies | Trade |
| Oct 28, 1998 | Signed as free agent | Aaron Fultz | — | San Francisco Giants | Free agent signing |
| Oct 27, 1998 | Signed as free agent | Craig Grebeck | — | Toronto Blue Jays | Free agent signing |
| Oct 27, 1998 | Signed as free agent | Steve Sisco | — | Atlanta Braves | Free agent signing |
| Oct 27, 1998 | Signed as free agent | Tim Unroe | — | Anaheim Angels | Free agent signing |
| Oct 26, 1998 | Signed as free agent | Izzy Molina | — | Arizona Diamondbacks | Free agent signing |
| Oct 23, 1998 | Signed as free agent | Milt Cuyler | — | Texas Rangers | Free agent signing |
| Oct 23, 1998 | Signed as free agent | Wiki Gonzalez | — | San Diego Padres | Free agent signing |
| Oct 23, 1998 | Signed as free agent | Marc Ronan | — | Houston Astros | Free agent signing |
| Oct 16, 1998 | Released | Toby Borland | Florida Marlins | — | Release |
| Oct 16, 1998 | Released | Pete Incaviglia | Houston Astros | — | Release |
| Oct 15, 1998 | Released | Jeff Manto | Cleveland Indians | — | Release |
| Oct 15, 1998 | Released | Chance Sanford | Pittsburgh Pirates | — | Release |
| Oct 12, 1998 | Trade | Scott Prouty | Seattle Mariners | Los Angeles Dodgers | Trade |
| Oct 12, 1998 | Trade | Eric Weaver | Los Angeles Dodgers | Seattle Mariners | Trade |
| Oct 9, 1998 | Released | Rickey Cradle | Seattle Mariners | — | Release |
| Oct 3, 1998 | Released | Todd Ritchie | Minnesota Twins | — | Release |
| Oct 2, 1998 | Released | Joel Adamson | Arizona Diamondbacks | — | Release |
| Oct 2, 1998 | Released | Chris Jones | San Francisco Giants | — | Release |
| Oct 2, 1998 | Signed | Brian Stokes | — | Tampa Bay Devil Rays | Amateur free agent signing |
| Oct 1, 1998 | Trade | John Halama | Houston Astros | Seattle Mariners | Trade |
| Sep 30, 1998 | Released | Steve Cooke | Cincinnati Reds | — | Release |
| Sep 29, 1998 | Released | Joe Hudson | Milwaukee Brewers | — | Release |
| Sep 29, 1998 | Released | Marcus Jensen | Milwaukee Brewers | — | Release |
| Sep 29, 1998 | Released | Jesse Levis | Milwaukee Brewers | — | Release |
| Sep 25, 1998 | Signed | Cha-Seung Baek | — | Seattle Mariners | Amateur free agent signing |
| Sep 25, 1998 | Signed | Guillermo Quiroz | — | Toronto Blue Jays | Amateur free agent signing |
| Sep 24, 1998 | Signed | Francisco Rodriguez | — | Anaheim Angels | Amateur free agent signing |
| Sep 22, 1998 | Signed | Alvin Colina | — | Colorado Rockies | Amateur free agent signing |
| Sep 19, 1998 | Signed as free agent | Joey Dawley | — | Atlanta Braves | Free agent signing |
| Sep 18, 1998 | Released | Cecil Fielder | Cleveland Indians | — | Release |
| Sep 16, 1998 | Released | Wayne Kirby | New York Mets | — | Release |
| Sep 15, 1998 | Signed | Melvin Dorta | — | Boston Red Sox | Amateur free agent signing |
| Sep 15, 1998 | Signed | Felix Sanchez | — | Chicago Cubs | Amateur free agent signing |
| Sep 14, 1998 | Released | Alex Diaz | San Francisco Giants | — | Release |
| Sep 12, 1998 | Trade | Cesar Crespo | New York Mets | Florida Marlins | Trade |
| Sep 11, 1998 | Released | Eddie Williams | San Diego Padres | — | Release |
| Sep 10, 1998 | Signed | Edwin Bellorin | — | Los Angeles Dodgers | Amateur free agent signing |
| Sep 9, 1998 | Released | Kevin Jarvis | Cincinnati Reds | — | Release |
| Sep 9, 1998 | Trade | Doug Nickle | Anaheim Angels | Philadelphia Phillies | Trade |
| Sep 9, 1998 | Trade | Damon Hollins | Atlanta Braves | Los Angeles Dodgers | Trade |
| Sep 9, 1998 | Trade | Jose Pimentel | Los Angeles Dodgers | Atlanta Braves | Trade |
| Sep 8, 1998 | Released | David West | Boston Red Sox | — | Release |
| Sep 8, 1998 | Trade | Anthony Briggs | Atlanta Braves | Colorado Rockies | Trade |
| Sep 7, 1998 | Signed | Jorge Toca | — | New York Mets | Amateur free agent signing |
| Sep 5, 1998 | Signed as free agent | Orlando Merced | — | Chicago Cubs | Free agent signing |
| Sep 4, 1998 | Released | Luis Rivera | Kansas City Royals | — | Release |
| Sep 3, 1998 | Trade | Unnamed | New York Mets | Kansas City Royals | $ |
| Sep 2, 1998 | Signed | Juan Perez | — | Boston Red Sox | Amateur free agent signing |
| Sep 1, 1998 | Released | Orlando Merced | Boston Red Sox | — | Release |
| Sep 1, 1998 | Signed | Jorge Vasquez | — | Kansas City Royals | Amateur free agent signing |
| Sep 1, 1998 | Released | Paul Wagner | Atlanta Braves | — | Release |
| Aug 31, 1998 | Trade | Corey Jenkins | Boston Red Sox | Chicago White Sox | Trade |
| Aug 31, 1998 | Trade | Chris Snopek | Chicago White Sox | Boston Red Sox | Trade |
| Aug 31, 1998 | Trade | Joey Cora | Seattle Mariners | Cleveland Indians | Trade |
| Aug 31, 1998 | Trade | David Bell | Cleveland Indians | Seattle Mariners | Trade |
| Aug 31, 1998 | Trade | John Vander Wal | Colorado Rockies | San Diego Padres | Trade |
| Aug 28, 1998 | Released | Steve Mintz | Pittsburgh Pirates | — | Release |
| Aug 28, 1998 | Trade | Gregg Jefferies | Philadelphia Phillies | Anaheim Angels | Trade |
| Aug 27, 1998 | Signed as free agent | Kevin Jarvis | — | Cincinnati Reds | Free agent signing |
| Aug 25, 1998 | Trade | Unnamed | Chicago Cubs | Minnesota Twins | $ |
| Aug 25, 1998 | Trade | Mike Morgan | Minnesota Twins | Chicago Cubs | Trade |
| Aug 24, 1998 | Signed | Vicente Padilla | — | Arizona Diamondbacks | Amateur free agent signing |
| Aug 23, 1998 | Trade | Shea Morenz | New York Yankees | San Diego Padres | Trade |
| Aug 23, 1998 | Trade | Ray Ricken | New York Yankees | San Diego Padres | Trade |
| Aug 23, 1998 | Trade | Jim Bruske | San Diego Padres | New York Yankees | Trade |
| Aug 23, 1998 | Trade | Brad Kaufman | San Diego Padres | New York Yankees | Trade |
| Aug 21, 1998 | Released | D. J. Carrasco | Cleveland Indians | — | Release |
| Aug 19, 1998 | Signed as free agent | Tony Fossas | — | Texas Rangers | Free agent signing |
| Aug 19, 1998 | Signed as free agent | Gary Gaetti | — | Chicago Cubs | Free agent signing |
| Aug 19, 1998 | Trade | David Cortes | Colorado Rockies | Atlanta Braves | Trade |
| Aug 18, 1998 | Trade | Jason Brester | San Francisco Giants | Colorado Rockies | Trade |
| Aug 16, 1998 | Released | Tom Pagnozzi | St. Louis Cardinals | — | Release |
| Aug 14, 1998 | Released | Gary Gaetti | St. Louis Cardinals | — | Release |
| Aug 14, 1998 | Signed as free agent | Brian Hunter | — | Chicago White Sox | Free agent signing |
| Aug 13, 1998 | Signed as free agent | Cecil Fielder | — | Cleveland Indians | Free agent signing |
| Aug 11, 1998 | Signed as free agent | Ricardo Jordan | — | New York Yankees | Free agent signing |
| Aug 10, 1998 | Released | Cecil Fielder | Anaheim Angels | — | Release |
| Aug 10, 1998 | Trade | Jermaine Allensworth | Kansas City Royals | New York Mets | Trade |
| Aug 10, 1998 | Trade | Jeffrey Hammonds | Baltimore Orioles | Cincinnati Reds | Trade |
| Aug 10, 1998 | Trade | Willie Greene | Cincinnati Reds | Baltimore Orioles | Trade |
| Aug 9, 1998 | Trade | Mark Little | Texas Rangers | St. Louis Cardinals | Trade |
| Aug 8, 1998 | Released | Ricardo Jordan | Cincinnati Reds | — | Release |
| Aug 7, 1998 | Signed as free agent | Jeff Huson | — | Arizona Diamondbacks | Free agent signing |
| Aug 7, 1998 | Released | Kevin Mitchell | Oakland Athletics | — | Release |
| Aug 6, 1998 | Signed | Jose Capellan | — | Atlanta Braves | Amateur free agent signing |
| Aug 6, 1998 | Trade | Randy Myers | Toronto Blue Jays | San Diego Padres | Trade |
| Aug 6, 1998 | Trade | Brian Loyd | San Diego Padres | Toronto Blue Jays | Trade |
| Aug 5, 1998 | Signed as free agent | Norm Charlton | — | Atlanta Braves | Free agent signing |
| Aug 5, 1998 | Signed | Enrique Cruz | — | New York Mets | Amateur free agent signing |
| Aug 5, 1998 | Signed as free agent | Paul Wagner | — | Atlanta Braves | Free agent signing |
| Aug 4, 1998 | Released | Tony Fossas | Chicago Cubs | — | Release |
| Aug 3, 1998 | Signed as free agent | Travis Driskill | — | Cleveland Indians | Free agent signing |
| Aug 3, 1998 | Released | Dale Sveum | New York Yankees | — | Release |
| Aug 2, 1998 | Released | Brian Hunter | St. Louis Cardinals | — | Release |
| Jul 31, 1998 | Released | Kevin Elster | Texas Rangers | — | Release |
| Jul 31, 1998 | Trade | Joe Hudson | Boston Red Sox | Milwaukee Brewers | Trade |
| Jul 31, 1998 | Trade | Eddy Diaz | Milwaukee Brewers | Boston Red Sox | Trade |
| Jul 31, 1998 | Trade | John Barnes | Boston Red Sox | Minnesota Twins | Trade |
| Jul 31, 1998 | Trade | Matt Kinney | Boston Red Sox | Minnesota Twins | Trade |
| Jul 31, 1998 | Trade | Joe Thomas | Boston Red Sox | Minnesota Twins | Trade |
| Jul 31, 1998 | Trade | Orlando Merced | Minnesota Twins | Boston Red Sox | Trade |
| Jul 31, 1998 | Trade | Greg Swindell | Minnesota Twins | Boston Red Sox | Trade |
| Jul 31, 1998 | Trade | Randy Johnson | Seattle Mariners | Houston Astros | Trade |
| Jul 31, 1998 | Trade | Freddy Garcia | Houston Astros | Seattle Mariners | Trade |
| Jul 31, 1998 | Trade | Carlos Guillen | Houston Astros | Seattle Mariners | Trade |
| Jul 31, 1998 | Trade | Dan DeYoung | Texas Rangers | Florida Marlins | Trade |
| Jul 31, 1998 | Trade | Jose Santos | Texas Rangers | Florida Marlins | Trade |
| Jul 31, 1998 | Trade | Todd Zeile | Florida Marlins | Texas Rangers | Trade |
| Jul 31, 1998 | Trade | Darren Oliver | Texas Rangers | St. Louis Cardinals | Trade |
| Jul 31, 1998 | Trade | Fernando Tatis | Texas Rangers | St. Louis Cardinals | Trade |
| Jul 31, 1998 | Trade | Royce Clayton | St. Louis Cardinals | Texas Rangers | Trade |
| Jul 31, 1998 | Trade | Todd Stottlemyre | St. Louis Cardinals | Texas Rangers | Trade |
| Jul 31, 1998 | Trade | Juan Guzman | Toronto Blue Jays | Baltimore Orioles | Trade |
| Jul 31, 1998 | Trade | Shannon Carter | Baltimore Orioles | Toronto Blue Jays | Trade |
| Jul 31, 1998 | Trade | Nerio Rodriguez | Baltimore Orioles | Toronto Blue Jays | Trade |
| Jul 31, 1998 | Trade | Tony Phillips | Toronto Blue Jays | New York Mets | Trade |
| Jul 31, 1998 | Trade | Leo Estrella | New York Mets | Toronto Blue Jays | Trade |
| Jul 31, 1998 | Trade | Ed Sprague | Toronto Blue Jays | Oakland Athletics | Trade |
| Jul 31, 1998 | Trade | Scott Rivette | Oakland Athletics | Toronto Blue Jays | Trade |
| Jul 31, 1998 | Trade | Justin Speier | Chicago Cubs | Florida Marlins | Trade |
| Jul 31, 1998 | Trade | Kevin Orie | Chicago Cubs | Florida Marlins | Trade |
| Jul 31, 1998 | Trade | Todd Noel | Chicago Cubs | Florida Marlins | Trade |
| Jul 31, 1998 | Trade | Felix Heredia | Florida Marlins | Chicago Cubs | Trade |
| Jul 31, 1998 | Trade | Steve Hoff | Florida Marlins | Chicago Cubs | Trade |
| Jul 31, 1998 | Trade | Ellis Burks | Colorado Rockies | San Francisco Giants | Trade |
| Jul 31, 1998 | Trade | Darryl Hamilton | San Francisco Giants | Colorado Rockies | Trade |
| Jul 31, 1998 | Trade | Jim Stoops | San Francisco Giants | Colorado Rockies | Trade |
| Jul 31, 1998 | Trade | Mike Kinkade | Milwaukee Brewers | New York Mets | Trade |
| Jul 31, 1998 | Trade | Bill Pulsipher | New York Mets | Milwaukee Brewers | Trade |
| Jul 31, 1998 | Trade | Carlos Perez | Montreal Expos | Los Angeles Dodgers | Trade |
| Jul 31, 1998 | Trade | Mark Grudzielanek | Montreal Expos | Los Angeles Dodgers | Trade |
| Jul 31, 1998 | Trade | Hiram Bocachica | Montreal Expos | Los Angeles Dodgers | Trade |
| Jul 31, 1998 | Trade | Peter Bergeron | Los Angeles Dodgers | Montreal Expos | Trade |
| Jul 31, 1998 | Trade | Wilton Guerrero | Los Angeles Dodgers | Montreal Expos | Trade |
| Jul 31, 1998 | Trade | Ted Lilly | Los Angeles Dodgers | Montreal Expos | Trade |
| Jul 31, 1998 | Trade | Jonny Tucker | Los Angeles Dodgers | Montreal Expos | Trade |
| Jul 31, 1998 | Trade | Unnamed | Arizona Diamondbacks | New York Mets | $ |
| Jul 31, 1998 | Trade | Unnamed | New York Mets | Arizona Diamondbacks | $ |
| Jul 31, 1998 | Trade | Willie Blair | Arizona Diamondbacks | New York Mets | Trade |
| Jul 31, 1998 | Trade | Jorge Fabregas | Arizona Diamondbacks | New York Mets | Trade |
| Jul 31, 1998 | Trade | Nelson Figueroa | New York Mets | Arizona Diamondbacks | Trade |
| Jul 31, 1998 | Trade | Bernard Gilkey | New York Mets | Arizona Diamondbacks | Trade |
| Jul 30, 1998 | Signed as free agent | Joel Bennett | — | Philadelphia Phillies | Free agent signing |
| Jul 30, 1998 | Signed as free agent | Luis Pineda | — | Detroit Tigers | Free agent signing |
| Jul 30, 1998 | Trade | Charlie O'Brien | Chicago White Sox | Anaheim Angels | Trade |
| Jul 30, 1998 | Trade | Jason Stockstill | Anaheim Angels | Chicago White Sox | Trade |
| Jul 30, 1998 | Trade | Brian Tokarse | Anaheim Angels | Chicago White Sox | Trade |
| Jul 30, 1998 | Trade | Peter Munro | Boston Red Sox | Toronto Blue Jays | Trade |
| Jul 30, 1998 | Trade | Jay Yennaco | Boston Red Sox | Toronto Blue Jays | Trade |
| Jul 30, 1998 | Trade | Mike Stanley | Toronto Blue Jays | Boston Red Sox | Trade |
| Jul 30, 1998 | Trade | Greg Colbrunn | Colorado Rockies | Atlanta Braves | Trade |
| Jul 30, 1998 | Trade | David Cortes | Atlanta Braves | Colorado Rockies | Trade |
| Jul 30, 1998 | Trade | Mike Porzio | Atlanta Braves | Colorado Rockies | Trade |
| Jul 29, 1998 | Signed | Ramon Santiago | — | Detroit Tigers | Amateur free agent signing |
| Jul 29, 1998 | Trade | Matt Karchner | Chicago White Sox | Chicago Cubs | Trade |
| Jul 29, 1998 | Trade | Jon Garland | Chicago Cubs | Chicago White Sox | Trade |
| Jul 28, 1998 | Released | Norm Charlton | Baltimore Orioles | — | Release |
| Jul 28, 1998 | Trade | Adam Robinson | Oakland Athletics | Cleveland Indians | Trade |
| Jul 27, 1998 | Released | Joel Bennett | Baltimore Orioles | — | Release |
| Jul 26, 1998 | Released | Paul Wagner | Milwaukee Brewers | — | Release |
| Jul 25, 1998 | Signed as free agent | Rusty Meacham | — | Pittsburgh Pirates | Free agent signing |
| Jul 25, 1998 | Released | Steve Ontiveros | Baltimore Orioles | — | Release |
| Jul 24, 1998 | Signed as free agent | Melvin Mora | — | New York Mets | Free agent signing |
| Jul 24, 1998 | Signed as free agent | Joe Oliver | — | Seattle Mariners | Free agent signing |
| Jul 24, 1998 | Trade | Reid Cornelius | Arizona Diamondbacks | Florida Marlins | Trade |
| Jul 23, 1998 | Trade | Darin Blood | San Francisco Giants | Baltimore Orioles | Trade |
| Jul 23, 1998 | Trade | Joe Carter | Baltimore Orioles | San Francisco Giants | Trade |
| Jul 23, 1998 | Trade | Doug Jones | Milwaukee Brewers | Cleveland Indians | Trade |
| Jul 23, 1998 | Trade | Eric Plunk | Cleveland Indians | Milwaukee Brewers | Trade |
| Jul 23, 1998 | Trade | Jacob Cruz | San Francisco Giants | Cleveland Indians | Trade |
| Jul 23, 1998 | Trade | Steve Reed | San Francisco Giants | Cleveland Indians | Trade |
| Jul 23, 1998 | Trade | Shawon Dunston | Cleveland Indians | San Francisco Giants | Trade |
| Jul 23, 1998 | Trade | Jose Mesa | Cleveland Indians | San Francisco Giants | Trade |
| Jul 23, 1998 | Trade | Alvin Morman | Cleveland Indians | San Francisco Giants | Trade |
| Jul 23, 1998 | Trade | Widd Workman | San Diego Padres | Los Angeles Dodgers | Trade |
| Jul 23, 1998 | Trade | Jim Bruske | Los Angeles Dodgers | San Diego Padres | Trade |
| Jul 22, 1998 | Signed as free agent | Jim Poole | — | Cleveland Indians | Free agent signing |
| Jul 21, 1998 | Signed as free agent | Jason Bere | — | Cincinnati Reds | Free agent signing |
| Jul 20, 1998 | Released | Billy Ripken | Detroit Tigers | — | Release |
| Jul 18, 1998 | Trade | Jason Wood | Oakland Athletics | Detroit Tigers | Trade |
| Jul 17, 1998 | Signed as free agent | Terry Mathews | — | Oakland Athletics | Free agent signing |
| Jul 17, 1998 | Trade | Esteban Loaiza | Pittsburgh Pirates | Texas Rangers | Trade |
| Jul 17, 1998 | Trade | Warren Morris | Texas Rangers | Pittsburgh Pirates | Trade |
| Jul 17, 1998 | Trade | Todd Van Poppel | Texas Rangers | Pittsburgh Pirates | Trade |
| Jul 16, 1998 | Released | Jason Bere | Chicago White Sox | — | Release |
| Jul 16, 1998 | Released | Joe Oliver | Detroit Tigers | — | Release |
| Jul 15, 1998 | Signed | Wily Mo Peña | — | New York Mets | Amateur free agent signing |
| Jul 15, 1998 | Released | Jim Poole | San Francisco Giants | — | Release |
| Jul 15, 1998 | Released | Tim Unroe | Chicago Cubs | — | Release |
| Jul 14, 1998 | Signed as free agent | Toby Borland | — | Florida Marlins | Free agent signing |
| Jul 14, 1998 | Signed as free agent | Scott Klingenbeck | — | Pittsburgh Pirates | Free agent signing |
| Jul 14, 1998 | Released | Rusty Meacham | St. Louis Cardinals | — | Release |
| Jul 13, 1998 | Signed as free agent | Luis Andujar | — | Chicago White Sox | Free agent signing |
| Jul 12, 1998 | Released | Bob Patterson | Chicago Cubs | — | Release |
| Jul 12, 1998 | Trade | Tim Worrell | Cleveland Indians | Oakland Athletics | Trade |
| Jul 10, 1998 | Released | Luis Andujar | Toronto Blue Jays | — | Release |
| Jul 10, 1998 | Trade | Unnamed | Los Angeles Dodgers | New York Mets | $ |
| Jul 10, 1998 | Trade | Greg McMichael | Los Angeles Dodgers | New York Mets | Trade |
| Jul 10, 1998 | Trade | Brian Bohanon | New York Mets | Los Angeles Dodgers | Trade |
| Jul 9, 1998 | Signed as free agent | Tim Laker | — | Pittsburgh Pirates | Free agent signing |
| Jul 9, 1998 | Signed as free agent | Jerrod Riggan | — | New York Mets | Free agent signing |
| Jul 8, 1998 | Released | Jeff Huson | Seattle Mariners | — | Release |
| Jul 8, 1998 | Signed | Juan Salas | — | Tampa Bay Devil Rays | Amateur free agent signing |
| Jul 7, 1998 | Released | Terry Mathews | Baltimore Orioles | — | Release |
| Jul 4, 1998 | Released | Luis Pineda | Arizona Diamondbacks | — | Release |
| Jul 4, 1998 | Trade | Jay Powell | Florida Marlins | Houston Astros | Trade |
| Jul 4, 1998 | Trade | Scott Makarewicz | Florida Marlins | Houston Astros | Trade |
| Jul 4, 1998 | Trade | Ramon Castro | Houston Astros | Florida Marlins | Trade |
| Jul 4, 1998 | Trade | Paul Konerko | Los Angeles Dodgers | Cincinnati Reds | Trade |
| Jul 4, 1998 | Trade | Dennys Reyes | Los Angeles Dodgers | Cincinnati Reds | Trade |
| Jul 4, 1998 | Trade | Jeff Shaw | Cincinnati Reds | Los Angeles Dodgers | Trade |
| Jul 3, 1998 | Signed | Eude Brito | — | Philadelphia Phillies | Amateur free agent signing |
| Jul 3, 1998 | Signed | Gustavo Chacin | — | Toronto Blue Jays | Amateur free agent signing |
| Jul 3, 1998 | Signed as free agent | Josias Manzanillo | — | New York Mets | Free agent signing |
| Jul 3, 1998 | Trade | Lenny Harris | Cincinnati Reds | New York Mets | Trade |
| Jul 3, 1998 | Trade | John Hudek | New York Mets | Cincinnati Reds | Trade |
| Jul 2, 1998 | Signed | Tony Blanco | — | Boston Red Sox | Amateur free agent signing |
| Jul 2, 1998 | Signed | Jorge Cantu | — | Tampa Bay Devil Rays | Amateur free agent signing |
| Jul 2, 1998 | Signed as free agent | Rex Hudler | — | Cleveland Indians | Free agent signing |
| Jul 2, 1998 | Released | Scott Klingenbeck | Cincinnati Reds | — | Release |
| Jul 2, 1998 | Signed | Alejandro Machado | — | Atlanta Braves | Amateur free agent signing |
| Jul 1, 1998 | Released | Josias Manzanillo | Tampa Bay Devil Rays | — | Release |
| Jul 1, 1998 | Signed as free agent | Tony Phillips | — | Toronto Blue Jays | Free agent signing |
| Jun 30, 1998 | Signed as free agent | Andy Tomberlin | — | Atlanta Braves | Free agent signing |
| Jun 29, 1998 | Signed | Clay Condrey | — | San Diego Padres | Amateur free agent signing |
| Jun 29, 1998 | Signed | Byron Gettis | — | Kansas City Royals | Amateur free agent signing |
| Jun 29, 1998 | Signed as free agent | Travis Harper | — | Tampa Bay Devil Rays | Free agent signing |
| Jun 29, 1998 | Released | Thomas Howard | Los Angeles Dodgers | — | Release |
| Jun 29, 1998 | Released | Andy Tomberlin | Detroit Tigers | — | Release |
| Jun 28, 1998 | Signed as free agent | Ken Huckaby | — | New York Yankees | Free agent signing |
| Jun 27, 1998 | Trade | Jermaine Allensworth | Pittsburgh Pirates | Kansas City Royals | Trade |
| Jun 27, 1998 | Trade | Manuel Bernal | Kansas City Royals | Pittsburgh Pirates | Trade |
| Jun 25, 1998 | Signed as free agent | Erik Hanson | — | Anaheim Angels | Free agent signing |
| Jun 25, 1998 | Signed as free agent | Luis Pineda | — | Arizona Diamondbacks | Free agent signing |
| Jun 25, 1998 | Released | Brian Shouse | Boston Red Sox | — | Release |
| Jun 24, 1998 | Released | Rex Hudler | Philadelphia Phillies | — | Release |
| Jun 24, 1998 | Trade | Dave Roberts | Detroit Tigers | Cleveland Indians | Trade |
| Jun 24, 1998 | Trade | Tim Worrell | Detroit Tigers | Cleveland Indians | Trade |
| Jun 24, 1998 | Trade | Geronimo Berroa | Cleveland Indians | Detroit Tigers | Trade |
| Jun 23, 1998 | Trade | Bip Roberts | Detroit Tigers | Oakland Athletics | Trade |
| Jun 23, 1998 | Trade | Russ Springer | Arizona Diamondbacks | Atlanta Braves | Trade |
| Jun 23, 1998 | Trade | Alan Embree | Atlanta Braves | Arizona Diamondbacks | Trade |
| Jun 22, 1998 | Signed as free agent | Chad Fonville | — | Colorado Rockies | Free agent signing |
| Jun 22, 1998 | Signed as free agent | Pat Listach | — | Philadelphia Phillies | Free agent signing |
| Jun 21, 1998 | Released | Tony Castillo | Chicago White Sox | — | Release |
| Jun 20, 1998 | Signed as free agent | Franklin Nunez | — | Philadelphia Phillies | Free agent signing |
| Jun 20, 1998 | Signed as free agent | Ruben Sierra | — | New York Mets | Free agent signing |
| Jun 20, 1998 | Trade | Ethan Faggett | Boston Red Sox | San Diego Padres | Trade |
| Jun 20, 1998 | Trade | Jim Leyritz | Boston Red Sox | San Diego Padres | Trade |
| Jun 20, 1998 | Trade | Carlos Reyes | San Diego Padres | Boston Red Sox | Trade |
| Jun 20, 1998 | Trade | Mandy Romero | San Diego Padres | Boston Red Sox | Trade |
| Jun 20, 1998 | Trade | Dario Veras | San Diego Padres | Boston Red Sox | Trade |
| Jun 19, 1998 | Signed as free agent | Tony Fossas | — | Chicago Cubs | Free agent signing |
| Jun 18, 1998 | Signed as free agent | D. J. Carrasco | — | Cleveland Indians | Free agent signing |
| Jun 18, 1998 | Trade | Ara Petrosian | Colorado Rockies | Oakland Athletics | Trade |
| Jun 18, 1998 | Trade | Mike Blais | Boston Red Sox | Houston Astros | Trade |
| Jun 18, 1998 | Trade | David West | Houston Astros | Boston Red Sox | Trade |
| Jun 16, 1998 | Signed | Heath Bell | — | New York Mets | Amateur free agent signing |
| Jun 16, 1998 | Released | Erik Hanson | Toronto Blue Jays | — | Release |
| Jun 16, 1998 | Signed as free agent | Jeff Manto | — | Cleveland Indians | Free agent signing |
| Jun 16, 1998 | Signed | Jason Pearson | — | Florida Marlins | Amateur free agent signing |
| Jun 16, 1998 | Trade | Rick Krivda | Cleveland Indians | Cincinnati Reds | Trade |
| Jun 16, 1998 | Trade | Eddie Priest | Cincinnati Reds | Cleveland Indians | Trade |
| Jun 16, 1998 | Trade | Christian Rojas | Cincinnati Reds | Cleveland Indians | Trade |
| Jun 14, 1998 | Released | D. J. Carrasco | Baltimore Orioles | — | Release |
| Jun 13, 1998 | Released | Ken Huckaby | Seattle Mariners | — | Release |
| Jun 12, 1998 | Released | Jeff Manto | Detroit Tigers | — | Release |
| Jun 11, 1998 | Signed | Nate Field | — | Montreal Expos | Amateur free agent signing |
| Jun 10, 1998 | Released | Tony Fossas | Seattle Mariners | — | Release |
| Jun 10, 1998 | Trade | Shawn Gilbert | New York Mets | St. Louis Cardinals | Trade |
| Jun 10, 1998 | Trade | Wayne Kirby | St. Louis Cardinals | New York Mets | Trade |
| Jun 9, 1998 | Signed as free agent | Howard Battle | — | Atlanta Braves | Free agent signing |
| Jun 9, 1998 | Signed as free agent | Mike Devereaux | — | San Diego Padres | Free agent signing |
| Jun 9, 1998 | Trade | Eric Estes | Baltimore Orioles | San Diego Padres | Trade |
| Jun 9, 1998 | Trade | Pete Smith | San Diego Padres | Baltimore Orioles | Trade |
| Jun 9, 1998 | Trade | Unnamed | Colorado Rockies | Oakland Athletics | $ |
| Jun 9, 1998 | Trade | Kurt Abbott | Oakland Athletics | Colorado Rockies | Trade |
| Jun 7, 1998 | Released | Howard Battle | Chicago White Sox | — | Release |
| Jun 5, 1998 | Signed | Corky Miller | — | Cincinnati Reds | Amateur free agent signing |
| Jun 5, 1998 | Trade | Mark Mangum | Colorado Rockies | Montreal Expos | Trade |
| Jun 4, 1998 | Released | Joel Peralta | Oakland Athletics | — | Release |
| Jun 4, 1998 | Released | Ramon Ramirez | Texas Rangers | — | Release |
| Jun 4, 1998 | Trade | Brad Clontz | Los Angeles Dodgers | New York Mets | Trade |
| Jun 4, 1998 | Trade | Hideo Nomo | Los Angeles Dodgers | New York Mets | Trade |
| Jun 4, 1998 | Trade | Greg McMichael | New York Mets | Los Angeles Dodgers | Trade |
| Jun 4, 1998 | Trade | Dave Mlicki | New York Mets | Los Angeles Dodgers | Trade |
| Jun 3, 1998 | Trade | Scott Brow | Arizona Diamondbacks | New York Yankees | Trade |
| Jun 3, 1998 | Trade | Joe Lisio | Arizona Diamondbacks | New York Yankees | Trade |
| Jun 3, 1998 | Trade | Willie Banks | New York Yankees | Arizona Diamondbacks | Trade |
| Jun 1, 1998 | Trade | Rod Lindsey | San Diego Padres | Detroit Tigers | Trade |
| May 29, 1998 | Released | Ruben Sierra | Chicago White Sox | — | Release |
| May 27, 1998 | Signed as free agent | Jim Abbott | — | Chicago White Sox | Free agent signing |
| May 26, 1998 | Signed as free agent | Ricky Bones | — | Kansas City Royals | Free agent signing |
| May 26, 1998 | Signed as free agent | Doug Linton | — | Minnesota Twins | Free agent signing |
| May 26, 1998 | Released | Jerome Walton | Tampa Bay Devil Rays | — | Release |
| May 25, 1998 | Released | Ricky Pickett | Arizona Diamondbacks | — | Release |
| May 25, 1998 | Signed as free agent | Ricky Pickett | — | Texas Rangers | Free agent signing |
| May 22, 1998 | Released | Ricky Bones | Minnesota Twins | — | Release |
| May 22, 1998 | Signed as free agent | Tim Hyers | — | Florida Marlins | Free agent signing |
| May 22, 1998 | Signed as free agent | Steve Schrenk | — | Boston Red Sox | Free agent signing |
| May 22, 1998 | Trade | Mike Piazza | Florida Marlins | New York Mets | Trade |
| May 22, 1998 | Trade | Geoff Goetz | New York Mets | Florida Marlins | Trade |
| May 22, 1998 | Trade | Preston Wilson | New York Mets | Florida Marlins | Trade |
| May 22, 1998 | Trade | Ed Yarnall | New York Mets | Florida Marlins | Trade |
| May 21, 1998 | Signed | Scott Cassidy | — | Toronto Blue Jays | Amateur free agent signing |
| May 21, 1998 | Signed as free agent | Mike Gulan | — | Florida Marlins | Free agent signing |
| May 19, 1998 | Signed | Lee Gardner | — | Tampa Bay Devil Rays | Amateur free agent signing |
| May 19, 1998 | Released | Tim Hyers | Arizona Diamondbacks | — | Release |
| May 18, 1998 | Signed as free agent | Ray Holbert | — | Montreal Expos | Free agent signing |
| May 14, 1998 | Signed | Eduardo Villacis | — | Colorado Rockies | Amateur free agent signing |
| May 14, 1998 | Trade | Manuel Barrios | Florida Marlins | Los Angeles Dodgers | Trade |
| May 14, 1998 | Trade | Bobby Bonilla | Florida Marlins | Los Angeles Dodgers | Trade |
| May 14, 1998 | Trade | Jim Eisenreich | Florida Marlins | Los Angeles Dodgers | Trade |
| May 14, 1998 | Trade | Charles Johnson | Florida Marlins | Los Angeles Dodgers | Trade |
| May 14, 1998 | Trade | Gary Sheffield | Florida Marlins | Los Angeles Dodgers | Trade |
| May 14, 1998 | Trade | Mike Piazza | Los Angeles Dodgers | Florida Marlins | Trade |
| May 14, 1998 | Trade | Todd Zeile | Los Angeles Dodgers | Florida Marlins | Trade |
| May 13, 1998 | Released | Ray Holbert | Atlanta Braves | — | Release |
| May 12, 1998 | Released | Rod Henderson | Montreal Expos | — | Release |
| May 12, 1998 | Signed as free agent | Rod Henderson | — | Milwaukee Brewers | Free agent signing |
| May 12, 1998 | Signed as free agent | Pete Incaviglia | — | Houston Astros | Free agent signing |
| May 12, 1998 | Released | Rich Sauveur | Cincinnati Reds | — | Release |
| May 12, 1998 | Signed as free agent | Rich Sauveur | — | Pittsburgh Pirates | Free agent signing |
| May 11, 1998 | Signed as free agent | Archie Corbin | — | Florida Marlins | Free agent signing |
| May 11, 1998 | Signed | Michel Hernandez | — | New York Yankees | Amateur free agent signing |
| May 11, 1998 | Signed as free agent | Jalal Leach | — | San Francisco Giants | Free agent signing |
| May 10, 1998 | Signed as free agent | Steve Decker | — | New York Mets | Free agent signing |
| May 9, 1998 | Trade | Greg Hansell | Oakland Athletics | Kansas City Royals | Trade |
| May 8, 1998 | Released | Steve Decker | Pittsburgh Pirates | — | Release |
| May 8, 1998 | Trade | Robert Perez | Seattle Mariners | Montreal Expos | Trade |
| May 8, 1998 | Trade | Raul Chavez | Montreal Expos | Seattle Mariners | Trade |
| May 8, 1998 | Trade | Rick Wilkins | Seattle Mariners | New York Mets | Trade |
| May 8, 1998 | Trade | Lindsay Gulin | New York Mets | Seattle Mariners | Trade |
| May 6, 1998 | Released | Archie Corbin | San Diego Padres | — | Release |
| May 6, 1998 | Released | Mike Devereaux | Los Angeles Dodgers | — | Release |
| May 6, 1998 | Signed as free agent | Ozzie Guillen | — | Atlanta Braves | Free agent signing |
| May 6, 1998 | Signed as free agent | Mark Whiten | — | Cleveland Indians | Free agent signing |
| May 6, 1998 | Trade | Scott Sanders | Detroit Tigers | San Diego Padres | Trade |
| May 5, 1998 | Trade | Ben VanRyn | Chicago Cubs | San Diego Padres | Trade |
| May 5, 1998 | Trade | Don Wengert | San Diego Padres | Chicago Cubs | Trade |
| May 4, 1998 | Signed as free agent | Joe Slusarski | — | Houston Astros | Free agent signing |
| May 1, 1998 | Released | Ozzie Guillen | Baltimore Orioles | — | Release |
| May 1, 1998 | Signed as free agent | Steve Ontiveros | — | Baltimore Orioles | Free agent signing |
| May 1998 | Released | Pat Listach | Cleveland Indians | — | Release |
| Apr 30, 1998 | Signed as free agent | Tim Hyers | — | Arizona Diamondbacks | Free agent signing |
| Apr 28, 1998 | Signed as free agent | Phil Hiatt | — | Cleveland Indians | Free agent signing |
| Apr 27, 1998 | Trade | Ricky Pickett | San Francisco Giants | Arizona Diamondbacks | Trade |
| Apr 27, 1998 | Trade | Chris Jones | Arizona Diamondbacks | San Francisco Giants | Trade |
| Apr 25, 1998 | Released | Jamie Brewington | Milwaukee Brewers | — | Release |
| Apr 23, 1998 | Released | Phil Hiatt | New York Yankees | — | Release |
| Apr 23, 1998 | Released | Pete Incaviglia | Detroit Tigers | — | Release |
| Apr 23, 1998 | Signed as free agent | Richie Lewis | — | Baltimore Orioles | Free agent signing |
| Apr 23, 1998 | Released | Steve Ontiveros | St. Louis Cardinals | — | Release |
| Apr 23, 1998 | Signed as free agent | Roberto Ramirez | — | San Diego Padres | Free agent signing |
| Apr 22, 1998 | Released | Tim Hyers | Arizona Diamondbacks | — | Release |
| Apr 20, 1998 | Released | Chris Turner | Minnesota Twins | — | Release |
| Apr 20, 1998 | Signed as free agent | Chris Turner | — | Kansas City Royals | Free agent signing |
| Apr 18, 1998 | Signed as free agent | Jim Brower | — | Cleveland Indians | Free agent signing |
| Apr 17, 1998 | Signed as free agent | Mike Butcher | — | Anaheim Angels | Free agent signing |
| Apr 17, 1998 | Released | Jerrod Riggan | Anaheim Angels | — | Release |
| Apr 15, 1998 | Released | Jim Brower | Texas Rangers | — | Release |
| Apr 15, 1998 | Signed as free agent | Jacob Brumfield | — | Florida Marlins | Free agent signing |
| Apr 9, 1998 | Signed as free agent | Brad Clontz | — | Los Angeles Dodgers | Free agent signing |
| Apr 9, 1998 | Signed as free agent | Pat Listach | — | Cleveland Indians | Free agent signing |
| Apr 8, 1998 | Trade | Mike Macfarlane | Kansas City Royals | Oakland Athletics | Trade |
| Apr 8, 1998 | Trade | Shane Mack | Oakland Athletics | Kansas City Royals | Trade |
| Apr 8, 1998 | Trade | Marc Kroon | San Diego Padres | Cincinnati Reds | Trade |
| Apr 8, 1998 | Trade | Buddy Carlyle | Cincinnati Reds | San Diego Padres | Trade |
| Apr 7, 1998 | Signed as free agent | Aaron Holbert | — | Seattle Mariners | Free agent signing |
| Apr 6, 1998 | Released | Jalal Leach | San Francisco Giants | — | Release |
| Apr 6, 1998 | Signed as free agent | David West | — | Houston Astros | Free agent signing |
| Apr 5, 1998 | Signed as free agent | Marcus Jensen | — | Milwaukee Brewers | Free agent signing |
| Apr 4, 1998 | Signed as free agent | Steve Montgomery | — | Baltimore Orioles | Free agent signing |
| Apr 4, 1998 | Released | Jeff Sparks | Colorado Rockies | — | Release |
| Apr 3, 1998 | Signed | Wil Ledezma | — | Boston Red Sox | Amateur free agent signing |
| Apr 3, 1998 | Signed as free agent | Carl Sadler | — | Cleveland Indians | Free agent signing |
| Apr 3, 1998 | Released | Steve Schrenk | St. Louis Cardinals | — | Release |
| Apr 2, 1998 | Released | Mike Gulan | St. Louis Cardinals | — | Release |
| Apr 1, 1998 | Signed | Maicer Izturis | — | Cleveland Indians | Amateur free agent signing |
| Apr 1, 1998 | Released | Peter Moylan | Minnesota Twins | — | Release |
| Apr 1, 1998 | Released | Tony Phillips | Anaheim Angels | — | Release |
| Apr 1, 1998 | Released | Carl Sadler | Montreal Expos | — | Release |
| Apr 1, 1998 | Signed as free agent | Steve Sparks | — | Anaheim Angels | Free agent signing |
| Apr 1, 1998 | Signed as free agent | Dave Stieb | — | Toronto Blue Jays | Free agent signing |
| Mar 31, 1998 | Signed as free agent | Greg Hansell | — | Oakland Athletics | Free agent signing |
| Mar 31, 1998 | Signed as free agent | Kevin Hodges | — | Houston Astros | Free agent signing |
| Mar 30, 1998 | Signed as free agent | Billy Ashley | — | Boston Red Sox | Free agent signing |
| Mar 30, 1998 | Released | Mike Butcher | Cleveland Indians | — | Release |
| Mar 30, 1998 | Signed | Jin Ho Cho | — | Boston Red Sox | Amateur free agent signing |
| Mar 30, 1998 | Released | Brad Clontz | Atlanta Braves | — | Release |
| Mar 30, 1998 | Signed as free agent | Carlos Garcia | — | Anaheim Angels | Free agent signing |
| Mar 30, 1998 | Signed as free agent | Brian Hunter | — | St. Louis Cardinals | Free agent signing |
| Mar 30, 1998 | Signed as free agent | Scott Livingstone | — | Montreal Expos | Free agent signing |
| Mar 30, 1998 | Signed as free agent | Mike Maddux | — | Montreal Expos | Free agent signing |
| Mar 30, 1998 | Signed as free agent | Derrick May | — | Montreal Expos | Free agent signing |
| Mar 30, 1998 | Released | Steve Montgomery | Cleveland Indians | — | Release |
| Mar 30, 1998 | Trade | Chip Hale | Anaheim Angels | St. Louis Cardinals | Trade |
| Mar 30, 1998 | Trade | Craig Shipley | St. Louis Cardinals | Anaheim Angels | Trade |
| Mar 30, 1998 | Trade | Sean Casey | Cleveland Indians | Cincinnati Reds | Trade |
| Mar 30, 1998 | Trade | Dave Burba | Cincinnati Reds | Cleveland Indians | Trade |
| Mar 30, 1998 | Trade | Keith Johns | Baltimore Orioles | Boston Red Sox | Trade |
| Mar 30, 1998 | Trade | Bo Dodson | Boston Red Sox | Baltimore Orioles | Trade |
| Mar 29, 1998 | Released | Billy Ashley | Los Angeles Dodgers | — | Release |
| Mar 29, 1998 | Released | Matt Miller | Texas Rangers | — | Release |
| Mar 28, 1998 | Trade | Juan Acevedo | New York Mets | St. Louis Cardinals | Trade |
| Mar 28, 1998 | Trade | Rigo Beltran | St. Louis Cardinals | New York Mets | Trade |
| Mar 27, 1998 | Signed as free agent | Chris Hammond | — | Florida Marlins | Free agent signing |
| Mar 27, 1998 | Signed as free agent | Matt Whiteside | — | Philadelphia Phillies | Free agent signing |
| Mar 26, 1998 | Signed as free agent | Mark Lemke | — | Boston Red Sox | Free agent signing |
| Mar 26, 1998 | Trade | Jesus Martinez | Florida Marlins | Cincinnati Reds | Trade |
| Mar 26, 1998 | Trade | Jim Bullinger | Chicago White Sox | Seattle Mariners | Trade |
| Mar 26, 1998 | Trade | Marty Weymouth | Seattle Mariners | Chicago White Sox | Trade |
| Mar 26, 1998 | Released | Pat Listach | Seattle Mariners | — | Release |
| Mar 25, 1998 | Released | Carlos Garcia | Cleveland Indians | — | Release |
| Mar 25, 1998 | Released | Greg Hansell | Arizona Diamondbacks | — | Release |
| Mar 25, 1998 | Released | Marcus Jensen | Detroit Tigers | — | Release |
| Mar 25, 1998 | Signed as free agent | Pat Lennon | — | Toronto Blue Jays | Free agent signing |
| Mar 24, 1998 | Released | Jacob Brumfield | Toronto Blue Jays | — | Release |
| Mar 24, 1998 | Released | Roy Smith | Seattle Mariners | — | Release |
| Mar 23, 1998 | Signed as free agent | Wil Cordero | — | Chicago White Sox | Free agent signing |
| Mar 23, 1998 | Released | Chris Hammond | Kansas City Royals | — | Release |
| Mar 23, 1998 | Signed | Orlando Hernandez | — | New York Yankees | Amateur free agent signing |
| Mar 23, 1998 | Released | Darrell May | Anaheim Angels | — | Release |
| Mar 23, 1998 | Released | Matt Whiteside | Texas Rangers | — | Release |
| Mar 22, 1998 | Released | Richie Lewis | Philadelphia Phillies | — | Release |
| Mar 21, 1998 | Signed | Antonio Perez | — | Cincinnati Reds | Amateur free agent signing |
| Mar 21, 1998 | Trade | Eric Owens | Cincinnati Reds | Florida Marlins | Trade |
| Mar 20, 1998 | Signed | Jorge De La Rosa | — | Arizona Diamondbacks | Amateur free agent signing |
| Mar 20, 1998 | Signed | Felix Diaz | — | San Francisco Giants | Amateur free agent signing |
| Mar 20, 1998 | Signed as free agent | Sean Maloney | — | Los Angeles Dodgers | Free agent signing |
| Mar 20, 1998 | Trade | Tim Belk | Cincinnati Reds | Detroit Tigers | Trade |
| Mar 20, 1998 | Trade | Kevin Baez | Detroit Tigers | Cincinnati Reds | Trade |
| Mar 20, 1998 | Trade | Brandon Villafuerte | New York Mets | Florida Marlins | Trade |
| Mar 20, 1998 | Trade | Rob Stratton | Florida Marlins | New York Mets | Trade |
| Mar 19, 1998 | Signed as free agent | Frank Charles | — | San Francisco Giants | Free agent signing |
| Mar 16, 1998 | Signed | Alex Serrano | — | Colorado Rockies | Amateur free agent signing |
| Mar 14, 1998 | Signed as free agent | Joey Eischen | — | Cincinnati Reds | Free agent signing |
| Mar 14, 1998 | Signed as free agent | Chad Fonville | — | New York Mets | Free agent signing |
| Mar 14, 1998 | Released | Doug Linton | New York Yankees | — | Release |
| Mar 14, 1998 | Trade | Tim Crabtree | Toronto Blue Jays | Texas Rangers | Trade |
| Mar 14, 1998 | Trade | Kevin Brown | Texas Rangers | Toronto Blue Jays | Trade |
| Mar 13, 1998 | Signed as free agent | Scott Klingenbeck | — | Cincinnati Reds | Free agent signing |
| Mar 12, 1998 | Signed as free agent | Mike Coolbaugh | — | Colorado Rockies | Free agent signing |
| Mar 12, 1998 | Released | Scott Klingenbeck | Texas Rangers | — | Release |
| Mar 11, 1998 | Released | Joey Eischen | New York Yankees | — | Release |
| Mar 11, 1998 | Released | Pat Lennon | Anaheim Angels | — | Release |
| Mar 11, 1998 | Signed as free agent | Tanyon Sturtze | — | Texas Rangers | Free agent signing |
| Mar 11, 1998 | Trade | Ben McDonald | Cleveland Indians | Milwaukee Brewers | Trade |
| Mar 11, 1998 | Trade | Mark Watson | Milwaukee Brewers | Cleveland Indians | Trade |
| Mar 10, 1998 | Released | Sean Maloney | Milwaukee Brewers | — | Release |
| Mar 9, 1998 | Signed as free agent | Kevin Baez | — | Detroit Tigers | Free agent signing |
| Mar 9, 1998 | Released | Chad Fonville | Cleveland Indians | — | Release |
| Mar 9, 1998 | Signed as free agent | Erik Hiljus | — | Detroit Tigers | Free agent signing |
| Mar 9, 1998 | Signed as free agent | Scott Leius | — | Kansas City Royals | Free agent signing |
| Mar 9, 1998 | Signed as free agent | Kevin Mitchell | — | Oakland Athletics | Free agent signing |
| Mar 9, 1998 | Released | David West | Cincinnati Reds | — | Release |
| Mar 8, 1998 | Signed as free agent | Mike Porzio | — | Atlanta Braves | Free agent signing |
| Mar 7, 1998 | Signed as free agent | Toby Borland | — | Philadelphia Phillies | Free agent signing |
| Mar 7, 1998 | Trade | Andy Fox | New York Yankees | Arizona Diamondbacks | Trade |
| Mar 7, 1998 | Trade | Todd Erdos | Arizona Diamondbacks | New York Yankees | Trade |
| Mar 7, 1998 | Trade | Marty Janzen | Arizona Diamondbacks | New York Yankees | Trade |
| Mar 6, 1998 | Released | Toby Borland | Cincinnati Reds | — | Release |
| Mar 6, 1998 | Released | Tanyon Sturtze | Texas Rangers | — | Release |
| Mar 4, 1998 | Signed as free agent | Robert Ellis | — | Milwaukee Brewers | Free agent signing |
| Mar 4, 1998 | Signed as free agent | John Wehner | — | Florida Marlins | Free agent signing |
| Mar 3, 1998 | Signed as free agent | Bubba Carpenter | — | New York Yankees | Free agent signing |
| Mar 3, 1998 | Released | Robert Ellis | Detroit Tigers | — | Release |
| Mar 2, 1998 | Signed | Miguel Asencio | — | Philadelphia Phillies | Amateur free agent signing |
| Mar 1, 1998 | Signed as free agent | Rich Sauveur | — | Cincinnati Reds | Free agent signing |
| Feb 27, 1998 | Signed as free agent | Midre Cummings | — | Cincinnati Reds | Free agent signing |
| Feb 27, 1998 | Signed as free agent | Jack McDowell | — | Anaheim Angels | Free agent signing |
| Feb 26, 1998 | Signed as free agent | Chris Nichting | — | Cleveland Indians | Free agent signing |
| Feb 24, 1998 | Released | Midre Cummings | Philadelphia Phillies | — | Release |
| Feb 23, 1998 | Signed | Marino Salas | — | Baltimore Orioles | Amateur free agent signing |
| Feb 22, 1998 | Signed | Ezequiel Astacio | — | Philadelphia Phillies | Amateur free agent signing |
| Feb 19, 1998 | Signed as free agent | Donn Pall | — | Florida Marlins | Free agent signing |
| Feb 18, 1998 | Signed as free agent | Jeff Sparks | — | Colorado Rockies | Free agent signing |
| Feb 17, 1998 | Signed | Nelson Cruz | — | New York Mets | Amateur free agent signing |
| Feb 16, 1998 | Signed as free agent | Shawon Dunston | — | Cleveland Indians | Free agent signing |
| Feb 15, 1998 | Signed as free agent | Steve Ontiveros | — | St. Louis Cardinals | Free agent signing |
| Feb 14, 1998 | Signed as free agent | Bill Swift | — | Seattle Mariners | Free agent signing |
| Feb 13, 1998 | Signed | Edwin Moreno | — | Texas Rangers | Amateur free agent signing |
| Feb 12, 1998 | Signed as free agent | Mike Butcher | — | Cleveland Indians | Free agent signing |
| Feb 10, 1998 | Trade | Joe Lisio | New York Mets | Arizona Diamondbacks | Trade |
| Feb 10, 1998 | Trade | Mike Bell | Arizona Diamondbacks | New York Mets | Trade |
| Feb 6, 1998 | Signed as free agent | Bobby Munoz | — | Baltimore Orioles | Free agent signing |
| Feb 6, 1998 | Signed as free agent | Curtis Pride | — | Atlanta Braves | Free agent signing |
| Feb 6, 1998 | Trade | Unnamed | New York Yankees | Minnesota Twins | $ |
| Feb 6, 1998 | Trade | Brian Buchanan | New York Yankees | Minnesota Twins | Trade |
| Feb 6, 1998 | Trade | Cristian Guzman | New York Yankees | Minnesota Twins | Trade |
| Feb 6, 1998 | Trade | Eric Milton | New York Yankees | Minnesota Twins | Trade |
| Feb 6, 1998 | Trade | Danny Mota | New York Yankees | Minnesota Twins | Trade |
| Feb 6, 1998 | Trade | Chuck Knoblauch | Minnesota Twins | New York Yankees | Trade |
| Feb 6, 1998 | Trade | A. J. Burnett | New York Mets | Florida Marlins | Trade |
| Feb 6, 1998 | Trade | Jesus Sanchez | New York Mets | Florida Marlins | Trade |
| Feb 6, 1998 | Trade | Rob Stratton | New York Mets | Florida Marlins | Trade |
| Feb 6, 1998 | Trade | Al Leiter | Florida Marlins | New York Mets | Trade |
| Feb 6, 1998 | Trade | Ralph Milliard | Florida Marlins | New York Mets | Trade |
| Feb 5, 1998 | Signed as free agent | Luis Rivera | — | Houston Astros | Free agent signing |
| Feb 5, 1998 | Trade | Roberto Petagine | New York Mets | Cincinnati Reds | Trade |
| Feb 5, 1998 | Trade | Yuri Sanchez | Cincinnati Reds | New York Mets | Trade |
| Feb 4, 1998 | Signed as free agent | Jose Canseco | — | Toronto Blue Jays | Free agent signing |
| Feb 3, 1998 | Signed as free agent | Andy Benes | — | Arizona Diamondbacks | Free agent signing |
| Feb 3, 1998 | Signed as free agent | Shawn Boskie | — | Montreal Expos | Free agent signing |
| Feb 3, 1998 | Signed as free agent | Joey Eischen | — | New York Yankees | Free agent signing |
| Feb 3, 1998 | Signed as free agent | Mike Mordecai | — | Montreal Expos | Free agent signing |
| Feb 3, 1998 | Signed as free agent | Deion Sanders | — | Cincinnati Reds | Free agent signing |
| Feb 2, 1998 | Signed as free agent | Terry Mulholland | — | Chicago Cubs | Free agent signing |
| Feb 2, 1998 | Signed as free agent | David West | — | Cincinnati Reds | Free agent signing |
| Feb 1998 | Signed as free agent | Chris Hatcher | — | Kansas City Royals | Free agent signing |
| Jan 31, 1998 | Signed as free agent | Gregg Olson | — | Arizona Diamondbacks | Free agent signing |
| Jan 30, 1998 | Signed as free agent | Pat Lennon | — | Anaheim Angels | Free agent signing |
| Jan 30, 1998 | Signed as free agent | Dennis Martinez | — | Atlanta Braves | Free agent signing |
| Jan 29, 1998 | Signed as free agent | Geronimo Berroa | — | Cleveland Indians | Free agent signing |
| Jan 29, 1998 | Signed as free agent | Ozzie Guillen | — | Baltimore Orioles | Free agent signing |
| Jan 29, 1998 | Signed as free agent | Pete Incaviglia | — | Detroit Tigers | Free agent signing |
| Jan 29, 1998 | Signed as free agent | Carlos Valdez | — | Boston Red Sox | Free agent signing |
| Jan 29, 1998 | Trade | Dave McCarty | San Francisco Giants | Seattle Mariners | Trade |
| Jan 29, 1998 | Trade | Scott Smith | Seattle Mariners | San Francisco Giants | Trade |
| Jan 29, 1998 | Trade | Jalal Leach | Seattle Mariners | San Francisco Giants | Trade |
| Jan 28, 1998 | Signed as free agent | Keith Mitchell | — | Boston Red Sox | Free agent signing |
| Jan 27, 1998 | Signed as free agent | Howard Battle | — | Chicago White Sox | Free agent signing |
| Jan 27, 1998 | Signed as free agent | Jim Bullinger | — | Chicago White Sox | Free agent signing |
| Jan 27, 1998 | Signed as free agent | Mike Munoz | — | Colorado Rockies | Free agent signing |
| Jan 27, 1998 | Signed as free agent | Matt Ruebel | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 27, 1998 | Signed as free agent | Dave Silvestri | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 27, 1998 | Signed as free agent | Jerome Walton | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 26, 1998 | Signed as free agent | Doug Linton | — | New York Yankees | Free agent signing |
| Jan 26, 1998 | Signed as free agent | Damon Mashore | — | Anaheim Angels | Free agent signing |
| Jan 25, 1998 | Signed | Ramon Nivar | — | Texas Rangers | Amateur free agent signing |
| Jan 25, 1998 | Signed as free agent | Olmedo Saenz | — | Chicago White Sox | Free agent signing |
| Jan 24, 1998 | Signed as free agent | Jarrod Patterson | — | Arizona Diamondbacks | Free agent signing |
| Jan 24, 1998 | Signed as free agent | Efrain Valdez | — | New York Mets | Free agent signing |
| Jan 23, 1998 | Signed as free agent | Tommy Greene | — | Atlanta Braves | Free agent signing |
| Jan 23, 1998 | Signed as free agent | Yorkis Perez | — | Philadelphia Phillies | Free agent signing |
| Jan 22, 1998 | Signed as free agent | Bryan Eversgerd | — | St. Louis Cardinals | Free agent signing |
| Jan 22, 1998 | Signed as free agent | Rickey Henderson | — | Oakland Athletics | Free agent signing |
| Jan 22, 1998 | Signed as free agent | Pat Rapp | — | Kansas City Royals | Free agent signing |
| Jan 22, 1998 | Signed as free agent | Rey Sanchez | — | San Francisco Giants | Free agent signing |
| Jan 22, 1998 | Signed as free agent | Craig Shipley | — | St. Louis Cardinals | Free agent signing |
| Jan 22, 1998 | Signed as free agent | Gary Thurman | — | Anaheim Angels | Free agent signing |
| Jan 21, 1998 | Signed as free agent | Alex Diaz | — | San Francisco Giants | Free agent signing |
| Jan 21, 1998 | Signed as free agent | Pete Harnisch | — | Cincinnati Reds | Free agent signing |
| Jan 21, 1998 | Signed as free agent | Phil Hiatt | — | New York Yankees | Free agent signing |
| Jan 21, 1998 | Signed as free agent | Tim Hyers | — | Arizona Diamondbacks | Free agent signing |
| Jan 20, 1998 | Signed as free agent | Terry Pendleton | — | Kansas City Royals | Free agent signing |
| Jan 20, 1998 | Signed as free agent | Phil Plantier | — | Toronto Blue Jays | Free agent signing |
| Jan 20, 1998 | Signed as free agent | Chris Seelbach | — | Seattle Mariners | Free agent signing |
| Jan 20, 1998 | Signed as free agent | Lee Smith | — | Kansas City Royals | Free agent signing |
| Jan 20, 1998 | Signed as free agent | Jesus Tavarez | — | Baltimore Orioles | Free agent signing |
| Jan 20, 1998 | Trade | Jon Ratliff | Chicago Cubs | Atlanta Braves | Trade |
| Jan 20, 1998 | Trade | Ray King | Atlanta Braves | Chicago Cubs | Trade |
| Jan 19, 1998 | Signed as free agent | Jolbert Cabrera | — | Cleveland Indians | Free agent signing |
| Jan 19, 1998 | Signed as free agent | Rich Robertson | — | Anaheim Angels | Free agent signing |
| Jan 19, 1998 | Signed | Jose Veras | — | Tampa Bay Devil Rays | Amateur free agent signing |
| Jan 19, 1998 | Signed as free agent | Bobby Witt | — | Texas Rangers | Free agent signing |
| Jan 16, 1998 | Signed as free agent | Mike Devereaux | — | Los Angeles Dodgers | Free agent signing |
| Jan 15, 1998 | Signed as free agent | Rod Beck | — | Chicago Cubs | Free agent signing |
| Jan 15, 1998 | Signed as free agent | Tim Raines | — | New York Yankees | Free agent signing |
| Jan 14, 1998 | Signed as free agent | Bob Hamelin | — | Milwaukee Brewers | Free agent signing |
| Jan 14, 1998 | Signed | Anderson Machado | — | Philadelphia Phillies | Amateur free agent signing |
| Jan 14, 1998 | Signed as free agent | Orlando Merced | — | Minnesota Twins | Free agent signing |
| Jan 14, 1998 | Signed as free agent | Brandon Puffer | — | Cincinnati Reds | Free agent signing |
| Jan 14, 1998 | Signed as free agent | Pete Walker | — | Boston Red Sox | Free agent signing |
| Jan 14, 1998 | Trade | Sean Bergman | San Diego Padres | Houston Astros | Trade |
| Jan 14, 1998 | Trade | James Mouton | Houston Astros | San Diego Padres | Trade |
| Jan 13, 1998 | Signed as free agent | Sean Berry | — | Houston Astros | Free agent signing |
| Jan 13, 1998 | Signed as free agent | Larry Casian | — | Chicago White Sox | Free agent signing |
| Jan 13, 1998 | Signed as free agent | Lou Frazier | — | Chicago White Sox | Free agent signing |
| Jan 13, 1998 | Signed as free agent | Ray Holbert | — | Atlanta Braves | Free agent signing |
| Jan 13, 1998 | Signed as free agent | Ron Karkovice | — | Cleveland Indians | Free agent signing |
| Jan 13, 1998 | Signed as free agent | Eddie Williams | — | San Diego Padres | Free agent signing |
| Jan 13, 1998 | Signed as free agent | Masato Yoshii | — | New York Mets | Free agent signing with first major-league team |
| Jan 12, 1998 | Signed as free agent | Jeff Ball | — | San Francisco Giants | Free agent signing |
| Jan 12, 1998 | Signed as free agent | Jeff Darwin | — | San Francisco Giants | Free agent signing |
| Jan 12, 1998 | Signed as free agent | Mark Gubicza | — | Los Angeles Dodgers | Free agent signing |
| Jan 12, 1998 | Signed as free agent | Chris Hammond | — | Kansas City Royals | Free agent signing |
| Jan 12, 1998 | Signed as free agent | Dean Hartgraves | — | San Francisco Giants | Free agent signing |
| Jan 12, 1998 | Signed as free agent | Richie Lewis | — | Philadelphia Phillies | Free agent signing |
| Jan 12, 1998 | Signed as free agent | Roberto Mejia | — | St. Louis Cardinals | Free agent signing |
| Jan 12, 1998 | Signed as free agent | Henry Mercedes | — | San Francisco Giants | Free agent signing |
| Jan 12, 1998 | Signed as free agent | Mike Robertson | — | Arizona Diamondbacks | Free agent signing |
| Jan 12, 1998 | Signed as free agent | Pete Rose | — | Cincinnati Reds | Free agent signing |
| Jan 11, 1998 | Signed as free agent | Mark Davis | — | Arizona Diamondbacks | Free agent signing |
| Jan 10, 1998 | Signed as free agent | William VanLandingham | — | Anaheim Angels | Free agent signing |
| Jan 9, 1998 | Signed as free agent | Reggie Harris | — | Houston Astros | Free agent signing |
| Jan 9, 1998 | Signed as free agent | Doug Johns | — | Baltimore Orioles | Free agent signing |
| Jan 9, 1998 | Signed as free agent | Norberto Martin | — | Anaheim Angels | Free agent signing |
| Jan 9, 1998 | Signed as free agent | Pete Schourek | — | Houston Astros | Free agent signing |
| Jan 9, 1998 | Signed as free agent | Ruben Sierra | — | Chicago White Sox | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Kent Bottenfield | — | St. Louis Cardinals | Free agent signing |
| Jan 8, 1998 | Released | Joe Crawford | New York Mets | — | Release |
| Jan 8, 1998 | Signed as free agent | John Cummings | — | Cleveland Indians | Free agent signing |
| Jan 8, 1998 | Signed as free agent | John Ericks | — | Cleveland Indians | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Jason Grimsley | — | Cleveland Indians | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Glenallen Hill | — | Seattle Mariners | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Jamie McAndrew | — | Cleveland Indians | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Willis Otanez | — | Baltimore Orioles | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Brad Pennington | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Jose Rijo | — | Cincinnati Reds | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Tim Spehr | — | New York Mets | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Andy Stankiewicz | — | Arizona Diamondbacks | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Darryl Strawberry | — | New York Yankees | Free agent signing |
| Jan 8, 1998 | Signed as free agent | Ben VanRyn | — | Chicago Cubs | Free agent signing |
| Jan 7, 1998 | Signed as free agent | Thomas Howard | — | Los Angeles Dodgers | Free agent signing |
| Jan 7, 1998 | Signed as free agent | Mark Langston | — | San Diego Padres | Free agent signing |
| Jan 7, 1998 | Signed as free agent | Steve Mintz | — | Pittsburgh Pirates | Free agent signing |
| Jan 7, 1998 | Signed as free agent | Tim Unroe | — | Chicago Cubs | Free agent signing |
| Jan 6, 1998 | Signed | Manny Acosta | — | New York Yankees | Amateur free agent signing |
| Jan 6, 1998 | Signed as free agent | Ricky Bones | — | Minnesota Twins | Free agent signing |
| Jan 6, 1998 | Signed as free agent | Brian Daubach | — | Florida Marlins | Free agent signing |
| Jan 6, 1998 | Signed as free agent | Carlos Garcia | — | Cleveland Indians | Free agent signing |
| Jan 6, 1998 | Signed | Anastacio Martinez | — | Boston Red Sox | Amateur free agent signing |
| Jan 6, 1998 | Signed | Jae Weong Seo | — | New York Mets | Amateur free agent signing |
| Jan 6, 1998 | Trade | Scotty Pace | Milwaukee Brewers | St. Louis Cardinals | Trade |
| Jan 5, 1998 | Signed as free agent | Brian Barber | — | Kansas City Royals | Free agent signing |
| Jan 5, 1998 | Signed as free agent | Jacob Brumfield | — | Toronto Blue Jays | Free agent signing |
| Jan 5, 1998 | Signed as free agent | Brent Cookson | — | Arizona Diamondbacks | Free agent signing |
| Jan 3, 1998 | Signed as free agent | Bruce Ruffin | — | Colorado Rockies | Free agent signing |
| Jan 2, 1998 | Signed as free agent | Adam Hyzdu | — | Arizona Diamondbacks | Free agent signing |
Every row is mapped onto the same trade / signing / release vocabulary the modern feed uses, with the era’s own type description kept on each row. Club names are the names of the day (the Boston Braves years, the Brooklyn Dodgers years), and each links to the franchise it is today. Some dates are only partially known or flagged approximate by the source; they are shown exactly as published, never completed to a fake precise day.