Bill Butland vs. Chris Zachary — Career Comparison

On the career pitching numbers, Bill Butland posted a stronger line than Chris Zachary. Bill Butland posted stronger numbers in ERA (3.88 vs 4.57) and WHIP (1.288 vs 1.491). By the career numbers, Bill Butland 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.