Babe Birrer vs. John Perkovich — Career Comparison

On the career pitching numbers, Babe Birrer posted a stronger line than John Perkovich. Babe Birrer posted stronger numbers in ERA (4.36 vs 7.2) and WHIP (1.446 vs 1.600). By the career numbers, Babe Birrer 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.