Moment: 1956 World Series Game 5—Perfection
It would be more than an understatement to say that Don Larsen was an unlikely candidate to pitch a perfect game in the World Series.
Among the 719 pitchers in baseball history with at least 1,500 innings pitched, Larsen's walk rate of 4.22 BB/9 is the 22nd-worst. In the month of September leading up to that World Series, he walked 23 batters over the course of 34.2 innings pitched, including eight walks in one outing.
But no one remembers any of that.
Larsen will forever be remembered not for all the times he walked batters, but for the one time that no one reached base against him.
There have been 21 perfect games since 1900, but only Larsen has thrown one during the playoffs.
It came at a pretty doggone critical time too, as the series was tied at two games apiece with the remaining games scheduled to be played in Brooklyn.
Runner-Up: 2001 ALDS Game 3—The flip
Trailing Oakland by a 2-0 margin in the best-of-five series but clinging to a 1-0 lead in the seventh inning, Mike Mussina gave up a double to Terrance Long.
With Jeremy Giambi evidently running through molasses with a refrigerator strapped to his back, right fielder Shane Spencer tracked down the ball and overthrew both of his cutoff men. It looked as though Giambi was going to score without a play at the plate when Derek Jeter came flying in from nowhere to flip the ball to Jorge Posada for the out.
New York would win the game and the series, eventually advancing to the World Series.
Also Considered: 2003 ALCS Game 7—Boone's moonshot
Aaron Boone entered the game as a pinch runner in the eighth inning, but he won the series with his bat in the 11th. Boone mashed the first pitch he saw from Tim Wakefield into the left field seats, sending the Yankees back to the World Series for the fifth time in six years.