What position did Mike Mussina primarily play?

What uniform number did Bret Saberhagen wear with the Royals? What position did Salvador Perez primarily play? Salvador Perez is best known for playing with which MLB team? What uniform number did Salvador Perez wear with the Royals? Which player was nicknamed "Moose"? What position did Jake Arrieta primarily play? Jake Arrieta is best known for playing with which MLB team? What uniform number did Jake Arrieta wear with the Cubs?