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Every official 2020 MLB transaction involving the Seattle Mariners on either side of the move: 68 trades, signings and releases dated and grouped by month, with MLB’s own description of each move. Both directions are covered: 65 moves land with the Mariners and 3 depart from them.
Showing 68 of 68 Seattle Mariners transactions
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 29, 2020 | Signed as free agent | Jimmy Yacabonis | — | Seattle Mariners | Seattle Mariners signed free agent RHP Jimmy Yacabonis to a minor league contract. |
| Dec 18, 2020 | Signed as free agent | Chris Flexen | — | Seattle Mariners | Seattle Mariners signed free agent RHP Chris Flexen. |
| Dec 18, 2020 | Signed as free agent | Chris Flexen | — | Seattle Mariners | Seattle Mariners signed free agent P Chris Flexen. |
| Dec 18, 2020 | Signed as free agent | Chris Flexen | — | Seattle Mariners | Seattle Mariners signed free agent P Chris Flexen. |
| Dec 18, 2020 | Signed as free agent | Chris Flexen | — | Seattle Mariners | Seattle Mariners signed free agent P Chris Flexen. |
| Dec 18, 2020 | Signed as free agent | Chris Flexen | — | Seattle Mariners | Seattle Mariners signed free agent RHP Chris Flexen, and. |
| Dec 16, 2020 | Signed as free agent | Keynan Middleton | — | Seattle Mariners | Seattle Mariners signed free agent RHP Keynan Middleton. |
| Dec 16, 2020 | Signed as free agent | Keynan Middleton | — | Seattle Mariners | Seattle Mariners signed free agent P Keynan Middleton. |
| Dec 16, 2020 | Signed as free agent | Keynan Middleton | — | Seattle Mariners | Seattle Mariners signed free agent P Keynan Middleton. |
| Dec 16, 2020 | Signed as free agent | Keynan Middleton | — | Seattle Mariners | Seattle Mariners signed free agent P Keynan Middleton. |
| Dec 16, 2020 | Signed as free agent | Keynan Middleton | — | Seattle Mariners | Seattle Mariners signed free agent RHP Keynan Middleton. |
| Dec 15, 2020 | Trade | Rafael Montero | Texas Rangers | Seattle Mariners | Texas Rangers traded RHP Rafael Montero to Seattle Mariners for RHP Jose Corniell and Player To Be Named Later. |
| Dec 11, 2020 | Signed as free agent | Mike Ahmed | — | Seattle Mariners | Seattle Mariners signed free agent 3B Mike Ahmed to a minor league contract. |
| Dec 11, 2020 | Signed as free agent | Ryan Scott | — | Seattle Mariners | Seattle Mariners signed free agent C Ryan Scott to a minor league contract. |
| Dec 3, 2020 | Signed as free agent | Sam Travis | — | Seattle Mariners | Seattle Mariners signed free agent 1B Sam Travis to a minor league contract. |
| Dec 1, 2020 | Signed as free agent | Alejandro Requena | — | Seattle Mariners | Seattle Mariners signed free agent RHP Alejandro Requena to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Nov 20, 2020 | Signed as free agent | José Godoy | — | Seattle Mariners | Seattle Mariners signed free agent C Jose Godoy to a minor league contract. |
| Nov 20, 2020 | Signed as free agent | Josh Morgan | — | Seattle Mariners | Seattle Mariners signed free agent C Josh Morgan to a minor league contract. |
| Nov 20, 2020 | Signed as free agent | Drew Steckenrider | — | Seattle Mariners | Seattle Mariners signed free agent RHP Drew Steckenrider to a minor league contract. |
| Nov 17, 2020 | Signed as free agent | Gerson Bautista | — | Seattle Mariners | Seattle Mariners signed free agent RHP Gerson Bautista to a minor league contract. |
| Nov 17, 2020 | Signed as free agent | Matt Magill | — | Seattle Mariners | Seattle Mariners signed free agent RHP Matt Magill to a minor league contract. |
| Nov 16, 2020 | Signed as free agent | Brady Lail | — | Seattle Mariners | Seattle Mariners signed free agent RHP Brady Lail to a minor league contract. |
| Nov 6, 2020 | Signed as free agent | Vinny Nittoli | — | Seattle Mariners | Seattle Mariners signed free agent RHP Vinny Nittoli to a minor league contract. |
| Nov 6, 2020 | Signed as free agent | Moises Gomez | — | Seattle Mariners | Seattle Mariners signed free agent RHP Moises Gomez to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Oct 29, 2020 | Signed as free agent | Kendall Graveman | — | Seattle Mariners | Seattle Mariners signed free agent RHP Kendall Graveman. |
| Oct 29, 2020 | Signed as free agent | Kendall Graveman | — | Seattle Mariners | Seattle Mariners signed free agent P Kendall Graveman. |
| Oct 29, 2020 | Signed as free agent | Kendall Graveman | — | Seattle Mariners | Seattle Mariners signed free agent P Kendall Graveman. |
| Oct 29, 2020 | Signed as free agent | Kendall Graveman | — | Seattle Mariners | Seattle Mariners signed free agent P Kendall Graveman. |
| Oct 29, 2020 | Signed as free agent | Kendall Graveman | — | Seattle Mariners | Seattle Mariners signed free agent RHP Kendall Graveman. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Sep 17, 2020 | Trade | Matt Brash | San Diego Padres | Seattle Mariners | San Diego Padres traded RHP Matt Brash to Seattle Mariners. |
| Sep 2, 2020 | Trade | Taylor Williams | Seattle Mariners | San Diego Padres | Seattle Mariners traded RHP Taylor Williams to San Diego Padres for Player To Be Named Later. |
| Sep 1, 2020 | Trade | Alberto Rodriguez | Toronto Blue Jays | Seattle Mariners | Toronto Blue Jays traded RF Alberto Rodriguez to Seattle Mariners. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Aug 31, 2020 | Trade | Taylor Trammell | San Diego Padres | Seattle Mariners | Seattle Mariners traded Austin Adams, C Austin Nola and RHP Dan Altavilla to San Diego Padres for RHP Andres Munoz, C Luis Torrens, Taylor Trammell and 3B Ty France. |
| Aug 27, 2020 | Trade | Taijuan Walker | Seattle Mariners | Toronto Blue Jays | Seattle Mariners traded RHP Taijuan Walker to Toronto Blue Jays for Player To Be Named Later. |
| Aug 24, 2020 | Trade | Daniel Vogelbach | Seattle Mariners | Toronto Blue Jays | Seattle Mariners traded 1B Daniel Vogelbach to Toronto Blue Jays for cash. |
| Aug 19, 2020 | Trade | Jimmy Yacabonis | San Diego Padres | Seattle Mariners | San Diego Padres traded RHP Jimmy Yacabonis to Seattle Mariners for cash. |
| Aug 14, 2020 | Released | Patrick Wisdom | — | Seattle Mariners | Seattle Mariners released 1B Patrick Wisdom. |
| Aug 10, 2020 | Signed as free agent | Seth Frankoff | — | Seattle Mariners | Seattle Mariners signed free agent RHP Seth Frankoff to a minor league contract and invited him to spring training. |
| Aug 6, 2020 | Signed as free agent | Bryan Shaw | — | Seattle Mariners | Seattle Mariners signed free agent Bryan Shaw. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jul 21, 2020 | Signed as free agent | Ty Duvall | — | Seattle Mariners | Seattle Mariners signed free agent C Ty Duvall to a minor league contract. |
| Jul 21, 2020 | Signed as free agent | Justin Lavey | — | Seattle Mariners | Seattle Mariners signed free agent 2B Justin Lavey to a minor league contract. |
| Jul 21, 2020 | Signed as free agent | Matt Scheffler | — | Seattle Mariners | Seattle Mariners signed free agent C Matt Scheffler to a minor league contract. |
| Jul 21, 2020 | Signed as free agent | Brett Rodriguez | — | Seattle Mariners | Seattle Mariners signed free agent SS Brett Rodriguez to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jun 29, 2020 | Signed | Connor Phillips | — | Seattle Mariners | Seattle Mariners signed RHP Connor Phillips. |
| Jun 26, 2020 | Signed | Kaden Polcovich | — | Seattle Mariners | Seattle Mariners signed IF Kaden Polcovich. |
| Jun 26, 2020 | Signed | Tyler Keenan | — | Seattle Mariners | Seattle Mariners signed 3B Tyler Keenan. |
| Jun 25, 2020 | Signed | Emerson Hancock | — | Seattle Mariners | Seattle Mariners signed RHP Emerson Hancock. |
| Jun 25, 2020 | Signed | Zach DeLoach | — | Seattle Mariners | Seattle Mariners signed OF Zach DeLoach. |
| Jun 25, 2020 | Signed | Taylor Dollard | — | Seattle Mariners | Seattle Mariners signed RHP Taylor Dollard. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Mar 20, 2020 | Released | Sam Tuivailala | — | Seattle Mariners | Seattle Mariners released RHP Sam Tuivailala. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Feb 23, 2020 | Signed as free agent | Rymer Liriano | — | Seattle Mariners | Seattle Mariners signed free agent OF Rymer Liriano to a minor league contract. |
| Feb 19, 2020 | Signed as free agent | Andy Sosa | — | Seattle Mariners | Seattle Mariners signed free agent OF Andy Sosa to a minor league contract. |
| Feb 19, 2020 | Signed as free agent | Julio Dilone | — | Seattle Mariners | Seattle Mariners signed free agent RHP Julio Dilone to a minor league contract. |
| Feb 19, 2020 | Signed as free agent | Anyelo Ovando | — | Seattle Mariners | Seattle Mariners signed free agent RHP Anyelo Ovando to a minor league contract. |
| Feb 17, 2020 | Signed as free agent | Cody Anderson | — | Seattle Mariners | Seattle Mariners signed free agent RHP Cody Anderson to a minor league contract and invited him to spring training. |
| Feb 12, 2020 | Signed as free agent | Taijuan Walker | — | Seattle Mariners | Seattle Mariners signed free agent RHP Taijuan Walker. |
| Feb 11, 2020 | Signed as free agent | Carlos González | — | Seattle Mariners | Seattle Mariners signed free agent RF Carlos Gonzalez to a minor league contract and invited him to spring training. |
| Feb 11, 2020 | Signed as free agent | Collin Cowgill | — | Seattle Mariners | Seattle Mariners signed free agent LF Collin Cowgill to a minor league contract and invited him to spring training. |
| Feb 11, 2020 | Signed as free agent | Manny Banuelos | — | Seattle Mariners | Seattle Mariners signed free agent LHP Manny Banuelos to a minor league contract and invited him to spring training. |
| Feb 11, 2020 | Signed as free agent | Wei-Yin Chen | — | Seattle Mariners | Seattle Mariners signed free agent LHP Wei-Yin Chen to a minor league contract and invited him to spring training. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jan 30, 2020 | Signed as free agent | Yoshihisa Hirano | — | Seattle Mariners | Seattle Mariners signed free agent RHP Yoshihisa Hirano. |
| Jan 29, 2020 | Signed as free agent | Dietrich Enns | — | Seattle Mariners | Seattle Mariners signed free agent LHP Dietrich Enns to a minor league contract. |
| Jan 24, 2020 | Signed as free agent | Alen Hanson | — | Seattle Mariners | Seattle Mariners signed free agent 2B Alen Hanson to a minor league contract. |
| Jan 24, 2020 | Signed as free agent | Alen Hanson | — | Seattle Mariners | Seattle Mariners signed free agent 2B Alen Hanson to a minor league contract and invited him to spring training. |
| Jan 22, 2020 | Signed as free agent | Joe Hudson | — | Seattle Mariners | Seattle Mariners signed free agent C Joe Hudson to a minor league contract and invited him to spring training. |
| Jan 15, 2020 | Signed as free agent | Chasen Bradford | — | Seattle Mariners | Seattle Mariners signed free agent RHP Chasen Bradford to a minor league contract. |
| Jan 8, 2020 | Signed as free agent | Ryan McLaughlin | — | Seattle Mariners | Seattle Mariners signed free agent SS Ryan McLaughlin to a minor league contract. |
| Jan 7, 2020 | Signed as free agent | Justin Novak | — | Seattle Mariners | Seattle Mariners signed free agent C Justin Novak to a minor league contract. |
Every row is captured from MLB’s official StatsAPI transactions feed with MLB’s published description unedited. A trade appears on both clubs’ pages for the season; signings include both major-league and minor-league contracts signed with the club; injury-list moves and minor-league affiliate-only transactions are outside this archive’s scope.
Transaction data: official MLB StatsAPI. Data provided by MLB Advanced Media. Archived and published by Legends Deck. Kept transaction types: Trade, Signed, Signed as free agent, Released.