John Perkovich vs. Keiichi Yabu — Career Comparison

On the career pitching numbers, Keiichi Yabu posted a stronger line than John Perkovich. Keiichi Yabu posted stronger numbers in ERA (4 vs 7.2) and WHIP (1.524 vs 1.600). By the career numbers, Keiichi Yabu 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.