Player rosters
How many pitchers constitute the team's pitching rotation or starting rotation?
Baseball
Player rosters. Roster, or squad, sizes differ between different leagues and different levels of organized play. Major League Baseball teams maintain 25-player active rosters. A typical 25-man roster in a league without the DH rule, such as MLB's National League, features: eight position players—catcher, four infielders, three outfielders—who play on a regular basis five starting pitchers who constitute the team's pitching rotation or starting rotation six relief pitchers, including one specialist closer, who constitute the team's bullpen (named for the off-field area where pitchers warm up) one backup, or substitute, catcher two backup infielders two backup outfielders one specialist pinch hitter, or a second backup catcher, or a seventh reliever