Jason Adam vs. Art Mahaffey — Career Comparison

Art Mahaffey built a career as a starting pitcher and Jason Adam as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jason Adam led in run prevention (ERA+ 198 vs 90), home run suppression (HR9+ 147 vs 79), and skill-based run prevention (DICE+ 126 vs 90). Role difference aside, Jason Adam holds a clear edge on every meaningful shared measure.