Jack Leiper vs. Adonis Rosa — Career Comparison

Looking at the career totals, Jack Leiper and Adonis Rosa are fairly close on the surface numbers. Adonis Rosa posted stronger numbers in ERA (4.5 vs 5.4) and WHIP (0.500 vs 1.778). Jack Leiper had the advantage in home runs allowed (0.6 per nine innings vs 4.5). By the career numbers, Adonis Rosa 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.