Zach Jackson vs. Dave Leonhard — Career Comparison

Looking at the career totals, Zach Jackson and Dave Leonhard are fairly close on the surface numbers. Zach Jackson posted stronger numbers in ERA (2.86 vs 3.15) and home runs allowed (0.27 per nine innings vs 0.85). Dave Leonhard had the advantage in WHIP (1.338 vs 1.394). 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.