Casey Janssen vs. Willard Mains — Career Comparison

Looking at the career totals, Casey Janssen and Willard Mains are fairly close on the surface numbers. Willard Mains posted stronger numbers in ERA (3.53 vs 3.63) and home runs allowed (0.17 per nine innings vs 0.88). Casey Janssen had the advantage in WHIP (1.238 vs 1.550). By the career numbers, Willard Mains 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.