Dan O'Brien vs. Alex Singleton — Career Comparison

Looking at the career totals, Dan O'Brien and Alex Singleton are fairly close on the surface numbers. Dan O'Brien posted stronger numbers in ERA (5.9 vs 6.75) and WHIP (1.931 vs 2.250). Alex Singleton had the advantage in home runs allowed (0 per nine innings vs 0.31). By the career numbers, Dan O'Brien 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.