Frank Mack vs. Roy Thomas — Career Comparison

Looking at the career totals, Frank Mack and Roy Thomas are fairly close on the surface numbers. Roy Thomas posted stronger numbers in ERA (3.82 vs 4.94) and WHIP (1.455 vs 1.732). Frank Mack had the advantage in home runs allowed (0.38 per nine innings vs 0.71). By the career numbers, Roy Thomas 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.