Casey Janssen vs. Mike Mattimore — Career Comparison

Looking at the career totals, Casey Janssen and Mike Mattimore are fairly close on the surface numbers. Casey Janssen posted stronger numbers in ERA (3.63 vs 3.83) and WHIP (1.238 vs 1.423). Mike Mattimore had the advantage in home runs allowed (0.22 per nine innings vs 0.88). 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.