A minimum of 9 on each team for a total of 18 in the National League and 10 players on each team for a total of 20 in the American league. In the MLB each team can have 40 players on their roster. But they can only have 25 players at a game. So the two teams together will have 50 total players. During a game there can only be a maximum of 13 players on the field at any given moment. 9 defensive and 4 offensive.
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