Johnny Lanning vs. Art Mahaffey — Career Comparison

On the career pitching numbers, Johnny Lanning posted a stronger line than Art Mahaffey. Johnny Lanning posted stronger numbers in ERA (3.58 vs 4.17) and home runs allowed (0.46 per nine innings vs 1.13). By the career numbers, Johnny Lanning 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.