John Perkovich vs. Francisco Rosario — Career Comparison

Looking at the career totals, John Perkovich and Francisco Rosario are fairly close on the surface numbers. Francisco Rosario posted stronger numbers in ERA (6.02 vs 7.2) and home runs allowed (1.28 per nine innings vs 5.4). John Perkovich had the advantage in WHIP (1.600 vs 1.824). By the career numbers, Francisco Rosario 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.