Zach Jackson vs. Charlie Kerfeld — Career Comparison

On the career pitching numbers, Zach Jackson posted a stronger line than Charlie Kerfeld. Zach Jackson posted stronger numbers in ERA (2.86 vs 4.2) and WHIP (1.394 vs 1.572). By the career numbers, Zach Jackson 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.