What position did Rollie Fingers primarily play?

What position did Phil Niekro primarily play? Phil Niekro is best known for playing with which MLB team? What uniform number did Phil Niekro wear with the Braves? Which player was nicknamed "Knucksie"? Rollie Fingers is best known for playing with which MLB team? What uniform number did Rollie Fingers wear with the Athletics? What position did Tony Pérez primarily play? Tony Pérez is best known for playing with which MLB team?