Willie Hernandez vs. Frank Mack — Career Comparison

Looking at the career totals, Willie Hernandez and Frank Mack are fairly close on the surface numbers. Willie Hernandez posted stronger numbers in ERA (3.38 vs 4.94) and WHIP (1.321 vs 1.732). Frank Mack had the advantage in home runs allowed (0.38 per nine innings vs 0.84). By the career numbers, Willie Hernandez 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.