Dan Jennings vs. Lou Mahaffey — Career Comparison

Looking at the career totals, Dan Jennings and Lou Mahaffey are fairly close on the surface numbers. Lou Mahaffey posted stronger numbers in ERA (3 vs 3.1) and home runs allowed (0 per nine innings vs 0.65). Dan Jennings had the advantage in WHIP (1.486 vs 1.667). By the career numbers, Lou Mahaffey 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.