Billy Koch vs. Brian O'Connor — Career Comparison

On the career pitching numbers, Billy Koch posted a stronger line than Brian O'Connor. Billy Koch posted stronger numbers in ERA (3.89 vs 5.11) and WHIP (1.466 vs 1.865). By the career numbers, Billy Koch 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.