John Perkovich vs. C. J. Riefenhauser — Career Comparison

On the career pitching numbers, C. J. Riefenhauser posted a stronger line than John Perkovich. C. J. Riefenhauser posted stronger numbers in ERA (6.3 vs 7.2) and home runs allowed (1.35 per nine innings vs 5.4). By the career numbers, C. J. Riefenhauser 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.