Hayden Birdsong vs. Wei-Yin Chen — Career Comparison

On the career pitching numbers, Wei-Yin Chen posted a stronger line than Hayden Birdsong. Wei-Yin Chen posted stronger numbers in ERA (4.18 vs 4.77) and WHIP (1.289 vs 1.438). By the career numbers, Wei-Yin Chen 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.