Robbie Erlin vs. Adam Peterson — Career Comparison

On the career pitching numbers, Robbie Erlin posted a stronger line than Adam Peterson. Robbie Erlin posted stronger numbers in ERA (4.87 vs 5.46) and WHIP (1.297 vs 1.516). By the career numbers, Robbie Erlin 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.