Andy Boswell vs. Jairo Diaz — Career Comparison

Looking at the career totals, Andy Boswell and Jairo Diaz are fairly close on the surface numbers. Jairo Diaz posted stronger numbers in ERA (4.86 vs 5.91) and WHIP (1.556 vs 1.969). Andy Boswell had the advantage in home runs allowed (0.28 per nine innings vs 1.09). By the career numbers, Jairo Diaz 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.