Joe Kohlman vs. David Robertson — Career Comparison

Looking at the career totals, Joe Kohlman and David Robertson are fairly close on the surface numbers. David Robertson posted stronger numbers in ERA (2.93 vs 5.27) and WHIP (1.204 vs 1.500). Joe Kohlman had the advantage in home runs allowed (0.33 per nine innings vs 0.82). By the career numbers, David Robertson 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.