Justin Duchscherer vs. John Perkovich — Career Comparison

On the career pitching numbers, Justin Duchscherer posted a stronger line than John Perkovich. Justin Duchscherer posted stronger numbers in ERA (3.13 vs 7.2) and WHIP (1.168 vs 1.600). By the career numbers, Justin Duchscherer 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.