Mike Marshall vs. Frank O'Connor — Career Comparison

Looking at the career totals, Mike Marshall and Frank O'Connor are fairly close on the surface numbers. Mike Marshall posted stronger numbers in ERA (3.14 vs 11.25) and WHIP (1.332 vs 2.750). Frank O'Connor had the advantage in home runs allowed (0 per nine innings vs 0.51). By the career numbers, Mike 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.