John Perkovich vs. Saul Rivera — Career Comparison

On the career pitching numbers, Saul Rivera posted a stronger line than John Perkovich. Saul Rivera posted stronger numbers in ERA (4.29 vs 7.2) and home runs allowed (0.55 per nine innings vs 5.4). By the career numbers, Saul Rivera 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.