Which player was nicknamed "Knucksie"?

What uniform number did Don Sutton wear with the Dodgers? 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? What position did Rollie Fingers primarily play? 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?