Brian O'Connor vs. Dwight Siebler — Career Comparison

On the career pitching numbers, Dwight Siebler posted a stronger line than Brian O'Connor. Dwight Siebler posted stronger numbers in ERA (3.45 vs 5.11) and WHIP (1.227 vs 1.865). By the career numbers, Dwight Siebler 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.