Hayden Birdsong vs. Jim Cosman — Career Comparison

On the career pitching numbers, Jim Cosman posted a stronger line than Hayden Birdsong. Jim Cosman posted stronger numbers in ERA (3.05 vs 4.77) and WHIP (1.355 vs 1.438). By the career numbers, Jim Cosman 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.