Jamie Arnold vs. Juan Mejia — Career Comparison

Looking at the career totals, Jamie Arnold and Juan Mejia are fairly close on the surface numbers. Juan Mejia posted stronger numbers in ERA (3.96 vs 5.73) and WHIP (1.272 vs 1.652). Jamie Arnold had the advantage in home runs allowed (0.58 per nine innings vs 0.88). By the career numbers, Juan Mejia 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.