Julio Mateo vs. Jim Peterson — Career Comparison

Looking at the career totals, Julio Mateo and Jim Peterson are fairly close on the surface numbers. Julio Mateo posted stronger numbers in ERA (3.68 vs 5.27) and WHIP (1.263 vs 1.665). Jim Peterson had the advantage in home runs allowed (0.74 per nine innings vs 1.27). By the career numbers, Julio Mateo 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.