Mark Esser vs. Jim Peterson — Career Comparison

Looking at the career totals, Mark Esser and Jim Peterson are fairly close on the surface numbers. Jim Peterson posted stronger numbers in ERA (5.27 vs 16.2) and WHIP (1.665 vs 3.600). Mark Esser had the advantage in home runs allowed (0 per nine innings vs 0.74). By the career numbers, Jim Peterson 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.