Sean O'Sullivan vs. Frank Seward — Career Comparison

Looking at the career totals, Sean O'Sullivan and Frank Seward are fairly close on the surface numbers. Frank Seward posted stronger numbers in ERA (5.15 vs 6.01) and home runs allowed (0.82 per nine innings vs 1.64). Sean O'Sullivan had the advantage in WHIP (1.616 vs 1.683). By the career numbers, Frank Seward 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.