Zach Jackson vs. Jim Sullivan — Career Comparison

Zach Jackson built a career as a starting pitcher and Jim Sullivan as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jim Sullivan posted stronger surface numbers — ERA 5.52 and WHIP 1.950 compared to 5.81 and 1.566 for Zach Jackson. By the career numbers, Jim Sullivan had the better of this cross-role comparison — though era context would sharpen the verdict.