Isidro Marquez vs. Jon Perlman — Career Comparison

Looking at the career totals, Isidro Marquez and Jon Perlman are fairly close on the surface numbers. Jon Perlman posted stronger numbers in ERA (6.35 vs 6.75) and home runs allowed (0.91 per nine innings vs 4.05). Isidro Marquez had the advantage in WHIP (1.650 vs 1.866). By the career numbers, Jon Perlman 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.