Sean Doolittle vs. Lefty Sullivan — Career Comparison

Looking at the career totals, Sean Doolittle and Lefty Sullivan are fairly close on the surface numbers. Sean Doolittle posted stronger numbers in ERA (3.2 vs 4.26) and WHIP (1.045 vs 1.421). Lefty Sullivan had the advantage in home runs allowed (0 per nine innings vs 0.96). By the career numbers, Sean Doolittle 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.