Sean Doolittle vs. John Shaffer — Career Comparison

Looking at the career totals, Sean Doolittle and John Shaffer are fairly close on the surface numbers. Sean Doolittle posted stronger numbers in ERA (3.2 vs 4.57) and WHIP (1.045 vs 1.492). John Shaffer had the advantage in home runs allowed (0.15 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.