John Firth vs. George Rettger — Career Comparison

Looking at the career totals, John Firth and George Rettger are fairly close on the surface numbers. George Rettger posted stronger numbers in ERA (3.67 vs 8) and WHIP (1.554 vs 2.111). John Firth had the advantage in home runs allowed (0 per nine innings vs 0.39). By the career numbers, George Rettger 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.