Jack Mercer vs. Willie Mills — Career Comparison

Looking at the career totals, Jack Mercer and Willie Mills are fairly close on the surface numbers. Jack Mercer posted stronger numbers in ERA (0 vs 8.44) and home runs allowed (0 per nine innings vs 1.13). Willie Mills had the advantage in WHIP (1.563 vs 2.000). By the career numbers, Jack Mercer 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.