Leo Mangum vs. Jim Peterson — Career Comparison

Looking at the career totals, Leo Mangum and Jim Peterson are fairly close on the surface numbers. Leo Mangum posted stronger numbers in WHIP (1.606 vs 1.665) and home runs allowed (0.52 per nine innings vs 0.74). Jim Peterson had the advantage in ERA (5.27 vs 5.37). By the career numbers, Leo Mangum 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.