Lefty Hopper vs. Robbie Ross — Career Comparison

Looking at the career totals, Lefty Hopper and Robbie Ross are fairly close on the surface numbers. Robbie Ross posted stronger numbers in ERA (3.92 vs 4.91) and WHIP (1.418 vs 1.727). Lefty Hopper had the advantage in home runs allowed (0 per nine innings vs 0.68). By the career numbers, Robbie Ross 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.