Walt Leverenz vs. Art Mahaffey — Career Comparison

On the career pitching numbers, Walt Leverenz posted a stronger line than Art Mahaffey. Walt Leverenz posted stronger numbers in ERA (3.15 vs 4.17) and home runs allowed (0.22 per nine innings vs 1.13). By the career numbers, Walt Leverenz 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.