Humberto Castellanos vs. Emmett O'Neill — Career Comparison

Looking at the career totals, Humberto Castellanos and Emmett O'Neill are fairly close on the surface numbers. Emmett O'Neill posted stronger numbers in ERA (4.76 vs 5.43) and home runs allowed (0.35 per nine innings vs 1.3). Humberto Castellanos had the advantage in WHIP (1.414 vs 1.709). By the career numbers, Emmett O'Neill 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.