Casey Janssen vs. Juan Mejia — Career Comparison

Looking at the career totals, Casey Janssen and Juan Mejia are fairly close on the surface numbers. Casey Janssen had the edge in ERA (3.63 vs 3.96). By the career numbers, Casey Janssen 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.