Hayden Birdsong vs. Gustavo Chacin — Career Comparison

On the career pitching numbers, Gustavo Chacin posted a stronger line than Hayden Birdsong. Gustavo Chacin posted stronger numbers in ERA (4.23 vs 4.77) and home runs allowed (1.17 per nine innings vs 1.37). By the career numbers, Gustavo Chacin 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.