Jack Leiter vs. Jim Mains — Career Comparison

Looking at the career totals, Jack Leiter and Jim Mains are fairly close on the surface numbers. Jack Leiter posted stronger numbers in ERA (4.8 vs 5.63) and WHIP (1.361 vs 1.500). Jim Mains had the advantage in home runs allowed (0 per nine innings vs 1.2). By the career numbers, Jack Leiter 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.