Sean Marshall vs. Frank O'Connor — Career Comparison

Looking at the career totals, Sean Marshall and Frank O'Connor are fairly close on the surface numbers. Sean Marshall posted stronger numbers in ERA (3.86 vs 11.25) and WHIP (1.368 vs 2.750). Frank O'Connor had the advantage in home runs allowed (0 per nine innings vs 0.88). By the career numbers, Sean Marshall 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.