Johnny Allen vs. Art Mahaffey — Career Comparison

On the career pitching numbers, Johnny Allen posted a stronger line than Art Mahaffey. Johnny Allen posted stronger numbers in ERA (3.75 vs 4.17) and home runs allowed (0.48 per nine innings vs 1.13). By the career numbers, Johnny Allen 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.