David Aardsma vs. Jimmy Key — Career Comparison

Jimmy Key built a career as a starting pitcher and David Aardsma as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jimmy Key led in walk avoidance (BB%+ 151 vs 76), run prevention (ERA+ 121 vs 109), and skill-based run prevention (DICE+ 102 vs 99). David Aardsma held the edge in strikeout rate (K%+ 120 vs 90). Keeping the role difference in mind, the edge still goes to Jimmy Key.