What is the number of players on a MLB team 's active roster ?
A team 's active roster consists of the following players : 5 outfielders , 2 catchers , 1 second baseman , 1 shortstop , 1 middle infielder ( either second baseman or shortstop ) , 1 first baseman , 1 third baseman , 1 corner infielder ( first or third baseman ) , one utility player who may be of any position and 9 pitchers ( who may be either starters , relievers or both ) .