John Firth vs. Joel Zumaya — Career Comparison

Looking at the career totals, John Firth and Joel Zumaya are fairly close on the surface numbers. Joel Zumaya posted stronger numbers in ERA (3.05 vs 8) and WHIP (1.402 vs 2.111). John Firth had the advantage in home runs allowed (0 per nine innings vs 0.77). 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.