9 or 10
Depends on the league. In MLB it is 9 on the defense at one time.
9 players in total
22 players are allowed on the field for a play, 11 on offense, 11 on defense.
They play baseball.
Ball Players . . .
In The game of Baseball there are 9 people in the field at once
11 players on each team offense and defense
amatteur baseball players