In baseball, a pinch hitter is a substitute batter. Batters can be substituted at any time while the ball is dead (not in active play); the manager may use any player who has not yet entered the game as a substitute. Unlike basketball, American football, or ice hockey, baseball does not have a "free substitution rule" and thus the replaced player in baseball is never allowed back into that game. The pinch hitter assumes the spot in the batting order of the player whom he replaces. The player chosen to be a pinch hitter is often a backup infielder or outfielder. In the major leagues, catchers are less likely to be called upon because most teams have only two catchers, while pitchers are almost never used as pinch-hitters, because they tend to be worse hitters than other players on the team. The pinch hitter may not re-enter the game after being replaced with another player. The American League of Major League Baseball, the Pacific League in Japan, the KBO League in Korea, and various other leagues use the designated hitter rule, such that pitchers seldom bat. This removes one possible situation where a pinch hitter may be desired.

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