Robbie Erlin vs. John Sullivan — Career Comparison

Looking at the career totals, Robbie Erlin and John Sullivan are fairly close on the surface numbers. John Sullivan posted stronger numbers in ERA (4.2 vs 4.87) and home runs allowed (0 per nine innings vs 1.13). Robbie Erlin had the advantage in WHIP (1.297 vs 2.133). By the career numbers, John Sullivan 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.