Wandy Peralta vs. Michael Petersen — Career Comparison

On the career pitching numbers, Wandy Peralta posted a stronger line than Michael Petersen. Wandy Peralta posted stronger numbers in ERA (3.77 vs 5.02) and WHIP (1.363 vs 1.593). 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.