Clay Parker vs. Adam Peterson — Career Comparison

On the career pitching numbers, Clay Parker posted a stronger line than Adam Peterson. Clay Parker posted stronger numbers in ERA (4.42 vs 5.46) and WHIP (1.436 vs 1.516). By the career numbers, Clay Parker 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.