Don Cooper vs. Willie Mills — Career Comparison

Looking at the career totals, Don Cooper and Willie Mills are fairly close on the surface numbers. Willie Mills posted stronger numbers in WHIP (1.563 vs 1.723) and home runs allowed (1.13 per nine innings vs 1.48). Don Cooper had the advantage in ERA (5.27 vs 8.44). By the career numbers, Willie Mills 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.