Tom Butters vs. Casey Janssen — Career Comparison

Looking at the career totals, Tom Butters and Casey Janssen are fairly close on the surface numbers. Tom Butters posted stronger numbers in ERA (3.1 vs 3.63) and home runs allowed (0.56 per nine innings vs 0.88). Casey Janssen had the advantage in WHIP (1.238 vs 1.453). By the career numbers, Tom Butters 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.