How Many Baseball Players Are On The Field At Once?

When on defense, a baseball team has nine players on the field. On offense, up to four players may be on the field at once (the batter plus three baserunners). 

This means that, at minimum, there are 10 players on the field at once. Depending on how many baserunners there are, there may be up to as many as 13 players on the field at the same time.

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