John Firth vs. Trevor Rosenthal — Career Comparison

Looking at the career totals, John Firth and Trevor Rosenthal are fairly close on the surface numbers. Trevor Rosenthal posted stronger numbers in ERA (3.36 vs 8) and WHIP (1.343 vs 2.111). John Firth had the advantage in home runs allowed (0 per nine innings vs 0.47). By the career numbers, Trevor Rosenthal 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.