John Firth vs. Mark Leiter Jr. — Career Comparison

Looking at the career totals, John Firth and Mark Leiter Jr. are fairly close on the surface numbers. Mark Leiter Jr. posted stronger numbers in ERA (4.6 vs 8) and WHIP (1.351 vs 2.111). John Firth had the advantage in home runs allowed (0 per nine innings vs 1.4). By the career numbers, Mark Leiter Jr. 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.