Jairo Diaz vs. Mac MacArthur — Career Comparison

Looking at the career totals, Jairo Diaz and Mac MacArthur are fairly close on the surface numbers. Mac MacArthur posted stronger numbers in WHIP (1.500 vs 1.556) and home runs allowed (0.17 per nine innings vs 1.09). Jairo Diaz had the advantage in ERA (4.86 vs 5.02). By the career numbers, Mac MacArthur 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.