John Perkovich vs. Kumar Rocker — Career Comparison

Kumar Rocker built a career as a starting pitcher and John Perkovich as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Kumar Rocker posted stronger surface numbers — ERA 5.45 and WHIP 1.474 compared to 7.2 and 1.600 for John Perkovich. By the career numbers, Kumar Rocker had the better of this cross-role comparison — though era context would sharpen the verdict.