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In the Majors, 25 from opening day until the end of August. That usually includes 5 starting pitchers, 6 relief pitchers, 8 starting position players, one extra catcher, and five bench players who can pinch hit, pinch run, become defensive substitutes in the later innings, and generally back up the starting position players. In September, the teams can expand their rosters up to 40, (to give some of the top minor league prospects whose seasons have ended a shot to play in the "bigs"). Playoff teams must reduce their roster back to 25 in October, and all of their players needed to be roster players for the team by Aug.1 to be eligible to play in the playoffs.

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13y ago

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