Slick Castleman vs. Emmett O'Neill — Career Comparison

Looking at the career totals, Slick Castleman and Emmett O'Neill are fairly close on the surface numbers. Slick Castleman posted stronger numbers in ERA (4.25 vs 4.76) and WHIP (1.478 vs 1.709). Emmett O'Neill had the advantage in home runs allowed (0.35 per nine innings vs 0.69). By the career numbers, Slick Castleman 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.