Manny Aybar vs. Bill Koski — Career Comparison

Looking at the career totals, Manny Aybar and Bill Koski are fairly close on the surface numbers. Manny Aybar posted stronger numbers in ERA (5.11 vs 6.67) and WHIP (1.522 vs 2.000). Bill Koski had the advantage in home runs allowed (0.67 per nine innings vs 1.13). By the career numbers, Manny Aybar 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.