John Firth vs. John Rocker — Career Comparison

Looking at the career totals, John Firth and John Rocker are fairly close on the surface numbers. John Rocker posted stronger numbers in ERA (3.42 vs 8) and WHIP (1.492 vs 2.111). John Firth had the advantage in home runs allowed (0 per nine innings vs 0.81). By the career numbers, John Rocker 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.