Jeremy Affeldt vs. Junior Guerra — Career Comparison

Junior Guerra built a career as a starting pitcher and Jeremy Affeldt as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Junior Guerra led in run prevention (ERA+ 124 vs 98), strikeout rate (K%+ 101 vs 81), and skill-based run prevention (DICE+ 105 vs 89). Role difference aside, Junior Guerra holds a clear edge on every meaningful shared measure.