Wilhelm is definitely the most unique member of this list, seeing as he pitched in a time when bullpens were used very differently than in today's game and because he pitched his entire career as a knuckleball specialist.
With 227 saves, Wilhelm ranks just 35th on the all-time list. Over his 21-year career, though, he recorded eight seasons of over 100 innings pitched as a relief pitcher.
His career ERA and WHIP are a sparkling 2.52 and 1.125, respectively, and he went 15-3 with a league-leading 2.43 ERA as a rookie in 1952. Ironically enough, he finished second in the Rookie of the Year voting to Joe Black.
