Spencer Arrighetti vs. Zach Plesac — Career Comparison

On the career pitching numbers, Zach Plesac posted a stronger line than Spencer Arrighetti. Zach Plesac posted stronger numbers in ERA (4.31 vs 4.69) and WHIP (1.239 vs 1.409). By the career numbers, Zach Plesac 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.