Jimmy Key vs. Adam Peterson — Career Comparison

On the career pitching numbers, Jimmy Key posted a stronger line than Adam Peterson. Jimmy Key posted stronger numbers in ERA (3.51 vs 5.46) and WHIP (1.241 vs 1.516). By the career numbers, Jimmy Key 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.