Jack Aker vs. Don Lee — Career Comparison

Don Lee built a career as a starting pitcher and Jack Aker as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Don Lee led in home run suppression (HR9+ 112 vs 76), run prevention (ERA+ 110 vs 89), and skill-based run prevention (DICE+ 103 vs 88). Role difference aside, Don Lee holds a clear edge on every meaningful shared measure.