Diego Castillo vs. Mutt Williams — Career Comparison

Looking at the career totals, Diego Castillo and Mutt Williams are fairly close on the surface numbers. Diego Castillo posted stronger numbers in ERA (3.2 vs 4.91) and WHIP (1.153 vs 1.364). Mutt Williams had the advantage in home runs allowed (0.82 per nine innings vs 1.07). By the career numbers, Diego Castillo had the better of this comparison — though ERA and WHIP alone don't account for era, park factors, or the defenses each pitcher worked behind.