Hayden Birdsong vs. Connie Marrero — Career Comparison

On the career pitching numbers, Connie Marrero posted a stronger line than Hayden Birdsong. Connie Marrero posted stronger numbers in ERA (3.67 vs 4.77) and WHIP (1.340 vs 1.438). By the career numbers, Connie Marrero 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.