Zach Jackson vs. Henry Mathewson — Career Comparison

Looking at the career totals, Zach Jackson and Henry Mathewson are fairly close on the surface numbers. Henry Mathewson posted stronger numbers in ERA (4.91 vs 5.81) and home runs allowed (0 per nine innings vs 1.28). Zach Jackson had the advantage in WHIP (1.566 vs 2.000). By the career numbers, Henry Mathewson 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.