Dan Petry vs. David Robertson — Career Comparison

Dan Petry built a career as a starting pitcher and David Robertson as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. David Robertson led in strikeout rate (K%+ 136 vs 80), run prevention (ERA+ 128 vs 90), and skill-based run prevention (DICE+ 119 vs 82). Role difference aside, David Robertson holds a clear edge on every meaningful shared measure.