John Perkovich vs. Joel Zumaya — Career Comparison

On the career pitching numbers, Joel Zumaya posted a stronger line than John Perkovich. Joel Zumaya posted stronger numbers in ERA (3.05 vs 7.2) and WHIP (1.402 vs 1.600). By the career numbers, Joel Zumaya 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.