Hayden Birdsong vs. Jose Contreras — Career Comparison

On the career pitching numbers, Jose Contreras posted a stronger line than Hayden Birdsong. Jose Contreras posted stronger numbers in ERA (4.57 vs 4.77) and WHIP (1.379 vs 1.438). By the career numbers, Jose Contreras 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.