José Lopez vs. Brian O'Connor — Career Comparison

Looking at the career totals, José Lopez and Brian O'Connor are fairly close on the surface numbers. José Lopez posted stronger numbers in ERA (4.5 vs 5.11) and home runs allowed (0 per nine innings vs 1.46). Brian O'Connor had the advantage in WHIP (1.865 vs 2.000). By the career numbers, José 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.