Alberto Castillo vs. Sean Doolittle — Career Comparison

On the career pitching numbers, Sean Doolittle posted a stronger line than Alberto Castillo. Sean Doolittle posted stronger numbers in ERA (3.2 vs 4.33) and WHIP (1.045 vs 1.541). By the career numbers, Sean Doolittle 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.