Jim Mann vs. Jim Peterson — Career Comparison

Looking at the career totals, Jim Mann and Jim Peterson are fairly close on the surface numbers. Jim Mann posted stronger numbers in ERA (4.83 vs 5.27) and WHIP (1.484 vs 1.665). Jim Peterson had the advantage in home runs allowed (0.74 per nine innings vs 1.42). By the career numbers, Jim Mann 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.