Dan O'Brien vs. Wandy Peralta — Career Comparison

Looking at the career totals, Dan O'Brien and Wandy Peralta are fairly close on the surface numbers. Wandy Peralta posted stronger numbers in ERA (3.77 vs 5.9) and WHIP (1.363 vs 1.931). Dan O'Brien had the advantage in home runs allowed (0.31 per nine innings vs 1.01). By the career numbers, Wandy Peralta 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.