Fred Mauer vs. Alberto Castillo — Career Comparison

Looking at the career totals, Fred Mauer and Alberto Castillo are fairly close on the surface numbers. Alberto Castillo posted stronger numbers in ERA (4.33 vs 36) and WHIP (1.541 vs 5.500). Fred Mauer had the advantage in home runs allowed (0 per nine innings vs 1.19). By the career numbers, Alberto 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.