Justin Atchley vs. Jerry Koosman — Career Comparison

Jerry Koosman built a career as a starting pitcher and Justin Atchley as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jerry Koosman posted stronger surface numbers — ERA 3.36 and WHIP 1.290 compared to 6.1 and 1.839 for Justin Atchley. By the career numbers, Jerry Koosman had the better of this cross-role comparison — though era context would sharpen the verdict.