Don Carlsen vs. Alfredo Simon — Career Comparison

Looking at the career totals, Don Carlsen and Alfredo Simon are fairly close on the surface numbers. Alfredo Simon posted stronger numbers in ERA (4.56 vs 6) and WHIP (1.419 vs 1.778). Don Carlsen had the advantage in home runs allowed (0.83 per nine innings vs 1.22). By the career numbers, Alfredo Simon 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.