Matthew Wade Stairs is a Canadian former professional baseball outfielder, first baseman, and designated hitter, who holds the record for most pinch-hit home runs in Major League Baseball (MLB) history with 23. His pinch-hit home run in the eighth inning of Game 4 in the 2008 National League Championship Series off the Los Angeles Dodgers reliever Jonathan Broxton was called "one of the most memorable home runs in Phillies history".

In baseball, a pinch hitter (PH) is a substitute batter. Batters can be substituted at any time while the ball is dead ; the manager may use any player who has not yet entered the game as a substitute. Unlike basketball, American football or ice hockey, and in a similar way to association football, baseball does not have a free substitution rule and thus the replaced player is not allowed back into that game. The pinch hitter assumes the spot in the batting order of the player whom he replaces. Pinch hitters are commonly used to replace a weak hitter or to gain a platoon advantage.