Joe Kohlman vs. Roberto Rivera — Career Comparison

Looking at the career totals, Joe Kohlman and Roberto Rivera are fairly close on the surface numbers. Joe Kohlman posted stronger numbers in WHIP (1.500 vs 1.583) and home runs allowed (0.33 per nine innings vs 1.5). Roberto Rivera had the advantage in ERA (4.5 vs 5.27). By the career numbers, Joe Kohlman 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.