John Fitzgerald vs. Brian O'Connor — Career Comparison

On the career pitching numbers, John Fitzgerald posted a stronger line than Brian O'Connor. John Fitzgerald posted stronger numbers in ERA (4.04 vs 5.11) and WHIP (1.564 vs 1.865). By the career numbers, John Fitzgerald 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.