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In modern day baseball, teams generally have five starting pitchers, and they take it in turn to start a game every fifth day (hence the phrase rotation). Sometimes, if the schedule pans out, a team can get away with a four man rotation, and in the distant past some teams managed a three man rotation.
A pitcher must be removed immediately upon the current at-bat or the current half-inning ends, whichever comes first, upon reaching the pitch count per day. Once a pitcher throws 21 pitches (under 14) or 31 pitches (15â18) in a game, the pitcher must rest and not participate in pitching. Furthermore, pitchers may not be catchers if more than 40 pitches were thrown by the player.