Hayden Birdsong vs. Al Mattern — Career Comparison

On the career pitching numbers, Al Mattern posted a stronger line than Hayden Birdsong. Al Mattern posted stronger numbers in ERA (3.37 vs 4.77) and home runs allowed (0.23 per nine innings vs 1.37). By the career numbers, Al Mattern 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.