Marty Bystrom vs. Frank Castillo — Career Comparison

Looking at the career totals, Marty Bystrom and Frank Castillo are fairly close on the surface numbers. Marty Bystrom posted stronger numbers in ERA (4.26 vs 4.56) and home runs allowed (0.58 per nine innings vs 1.07). Frank Castillo had the advantage in WHIP (1.378 vs 1.428). By the career numbers, Marty Bystrom 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.