Yoan Lopez vs. Brian O'Connor — Career Comparison

Looking at the career totals, Yoan Lopez and Brian O'Connor are fairly close on the surface numbers. Yoan Lopez posted stronger numbers in ERA (4.39 vs 5.11) and WHIP (1.393 vs 1.865). Brian O'Connor had the advantage in home runs allowed (1.46 per nine innings vs 1.76). By the career numbers, Yoan Lopez 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.