J. P. Feyereisen vs. Brian O'Connor — Career Comparison

On the career pitching numbers, J. P. Feyereisen posted a stronger line than Brian O'Connor. J. P. Feyereisen posted stronger numbers in ERA (3.27 vs 5.11) and WHIP (1.137 vs 1.865). By the career numbers, J. P. Feyereisen 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.