Jim Hayes vs. Don Kaiser — Career Comparison

Looking at the career totals, Jim Hayes and Don Kaiser are fairly close on the surface numbers. Don Kaiser posted stronger numbers in ERA (4.15 vs 8.36) and WHIP (1.458 vs 2.179). Jim Hayes had the advantage in home runs allowed (0 per nine innings vs 0.79). By the career numbers, Don Kaiser 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.