Zach McClellan vs. Hugh O'Neill — Career Comparison

Looking at the career totals, Zach McClellan and Hugh O'Neill are fairly close on the surface numbers. Hugh O'Neill posted stronger numbers in ERA (5.03 vs 5.79) and WHIP (1.735 vs 1.929). Zach McClellan had the advantage in home runs allowed (0 per nine innings vs 0.79). By the career numbers, Hugh 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.