What is a Perfect Game? Definition and Examples

What is a Perfect Game?

A perfect game is the rarest single-game achievement in baseball: a pitcher faces the minimum 27 batters and retires every one of them. No hits, no walks, no batters hit by pitches, no reaching on error, no catcher's interference — nobody reaches base, ever. A perfect game is by definition also a no-hitter and a shutout, but it is stricter than both, because a no-hitter still allows walks and errors. Twenty-seven up, twenty-seven down, across at least nine innings.

How a Perfect Game is Defined

Major League Baseball's official rules require that a single team's pitching staff allows no opposing batter to reach base over a regulation-length complete game. In practice every official perfect game has been thrown by one pitcher, though the rule technically permits multiple pitchers. The conditions are absolute:

• Minimum 27 batters faced (more only if extra innings were ever needed, which has never happened in a recognized perfect game).
• Zero hits, zero walks, zero hit batters, zero errors that allow a runner on, zero catcher's interference.
• The pitcher's team must win, since a home team leading after the top of the ninth would not bat again — every perfecto has ended after the pitching team recorded the 27th out.

A single defensive misplay scored as an error breaks perfection instantly, even if no hit is allowed; the game can still become a no-hitter but never a perfect game.

Worked Example

There have been just 24 perfect games in modern MLB history. The most recent: Domingo Germán of the New York Yankees retired all 27 Oakland Athletics on June 28, 2023, striking out nine. In 2012 alone, three were thrown — Philip Humber, Matt Cain, and Félix Hernández — a historic clustering. The most famous remains Don Larsen's perfect game for the Yankees in Game 5 of the 1956 World Series, the only perfect game in postseason history. Cain's 2012 gem tied the record with 14 strikeouts, pairing dominance with the required flawless defense behind him.

Why a Perfect Game Matters

For pitchers, a perfect game is a career-defining line on a Hall of Fame résumé and an instant entry into a 24-name club. For fans and collectors, perfect-game memorabilia and rookie cards of perfect-game pitchers carry premium value. Statistically it represents the ceiling of the quality start concept and produces a near-maximum game score — Cain and Hernández both posted scores near the top of the all-time chart. Unlike season-long metrics, it is a binary, unforgettable event that drives ticket sales, broadcast ratings, and lasting legacy.

Limitations and Common Misconceptions

A perfect game is not the same as a no-hitter: a no-hitter can include walks, errors, and hit batsmen, while a perfect game cannot. A combined no-hitter thrown by multiple pitchers is recognized, but the only thing separating "perfect" from "no-hit" is baserunners — a single walk ends perfection while the no-hitter survives. It also requires elite defense, not just elite pitching; a routine grounder booted into an error erases it. Finally, dominance is not required — Germán struck out nine, but a pitcher could theoretically be perfect with very few strikeouts if every ball in play is converted.

Related Terms

• What is a no-hitter?
• What is the immaculate inning?
• What is game score?
• What is a quality start?
• What is the save?

In Legends Deck: pitchers who own perfect games or no-hitters carry elevated "command" and "control" ratings, lowering simulated walk and hit rates against your card. Stack enough strikeout and command upside and your ace can chase a 27-up shutout in-game — a rare event the simulation tracks and rewards with bonus card value.