Troy Percival vs. Adam Peterson — Career Comparison

Adam Peterson built a career as a starting pitcher and Troy Percival as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Troy Percival posted stronger surface numbers — ERA 3.17 and WHIP 1.143 compared to 5.46 and 1.516 for Adam Peterson. By the career numbers, Troy Percival had the better of this cross-role comparison — though era context would sharpen the verdict.