Keith Butler vs. Alberto Castillo — Career Comparison

Looking at the career totals, Keith Butler and Alberto Castillo are fairly close on the surface numbers. Keith Butler posted stronger numbers in WHIP (1.409 vs 1.541) and home runs allowed (0 per nine innings vs 1.19). Alberto Castillo had the advantage in ERA (4.33 vs 6.14). By the career numbers, Keith Butler 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.