Sean O'Sullivan vs. Tomoyuki Sugano — Career Comparison

Looking at the career totals, Sean O'Sullivan and Tomoyuki Sugano are fairly close on the surface numbers. Tomoyuki Sugano posted stronger numbers in ERA (4.64 vs 6.01) and WHIP (1.344 vs 1.616). Sean O'Sullivan had the advantage in home runs allowed (1.64 per nine innings vs 1.89). By the career numbers, Tomoyuki Sugano 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.