Nine players on the field is correct. In Major League Baseball, the total number of active players, field and dugout, is 25. (except for the last few weeks of the season when teams may expand their rosters.)
Major League rosters are 25 players through most of the season, but when it is September 1st the rosters are expanded to 40 until the end of the regular season.
9, I'm pretty sure!
Baseball is played with nine players in a team. For more details, see the link: