Dan O'Brien vs. Hipolito Peña — Career Comparison

Looking at the career totals, Dan O'Brien and Hipolito Peña are fairly close on the surface numbers. Hipolito Peña posted stronger numbers in ERA (4.84 vs 5.9) and WHIP (1.572 vs 1.931). Dan O'Brien had the advantage in home runs allowed (0.31 per nine innings vs 1.12). By the career numbers, Hipolito Peña 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.