Hayden Birdsong vs. Mike Mussina — Career Comparison

On the career pitching numbers, Mike Mussina posted a stronger line than Hayden Birdsong. Mike Mussina posted stronger numbers in ERA (3.68 vs 4.77) and WHIP (1.200 vs 1.438). By the career numbers, Mike Mussina 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.