Sean O'Sullivan vs. Jim St. Vrain — Career Comparison

Sean O'Sullivan built a career as a starting pitcher and Jim St. Vrain as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jim St. Vrain posted stronger surface numbers — ERA 2.08 and WHIP 1.189 compared to 6.01 and 1.616 for Sean O'Sullivan. By the career numbers, Jim St. Vrain had the better of this cross-role comparison — though era context would sharpen the verdict.