Zach Jackson vs. John Slappey — Career Comparison

Looking at the career totals, Zach Jackson and John Slappey are fairly close on the surface numbers. Zach Jackson posted stronger numbers in ERA (5.81 vs 7.11) and WHIP (1.566 vs 3.000). John Slappey had the advantage in home runs allowed (0 per nine innings vs 1.28). 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.