John Jackson vs. Jack O'Connor — Career Comparison

John Jackson built a career as a starting pitcher and Jack O'Connor as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jack O'Connor posted stronger surface numbers — ERA 4.89 and WHIP 1.657 compared to 6 and 2.019 for John Jackson. By the career numbers, Jack O'Connor had the better of this cross-role comparison — though era context would sharpen the verdict.