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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.
Starting pitcher: four innings in a five-inning shortened game, five innings in a game lasting six innings or more. Relief pitcher: one out. http://mlb.mlb.com/mlb/official_info/off... The starting pitcher must pitch 5 innings in order to qualify for the win in a major league game. The only exception is if a game is rained out and is only five innings long. Then the starting pitcher must pitch at least four innings. aaron Â· 9 years ago.