Unknown Clark vs. Art Mahaffey — Career Comparison

Looking at the career totals, Unknown Clark and Art Mahaffey are fairly close on the surface numbers. Art Mahaffey posted stronger numbers in ERA (4.17 vs 7.5) and WHIP (1.351 vs 1.500). Unknown Clark had the advantage in home runs allowed (0 per nine innings vs 1.13). By the career numbers, Art Mahaffey 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.