Frederick Fass vs. Willis Roberts — Career Comparison

Looking at the career totals, Frederick Fass and Willis Roberts are fairly close on the surface numbers. Willis Roberts posted stronger numbers in ERA (4.64 vs 10.34) and WHIP (1.521 vs 2.106). Frederick Fass had the advantage in home runs allowed (0.57 per nine innings vs 0.94). By the career numbers, Willis Roberts 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.