Alberto Castillo vs. Ryne Duren — Career Comparison

On the career pitching numbers, Ryne Duren posted a stronger line than Alberto Castillo. Ryne Duren posted stronger numbers in ERA (3.83 vs 4.33) and WHIP (1.442 vs 1.541). By the career numbers, Ryne Duren 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.