Rollin Cook vs. Michael Kelly — Career Comparison

Looking at the career totals, Rollin Cook and Michael Kelly are fairly close on the surface numbers. Michael Kelly posted stronger numbers in ERA (3.04 vs 7.24) and WHIP (1.287 vs 1.829). Rollin Cook had the advantage in home runs allowed (0 per nine innings vs 0.79). By the career numbers, Michael Kelly 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.