Sean O'Sullivan vs. Charlie Williams — Career Comparison

Sean O'Sullivan built a career as a starting pitcher and Charlie Williams as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Charlie Williams posted stronger surface numbers — ERA 3.97 and WHIP 1.587 compared to 6.01 and 1.616 for Sean O'Sullivan. By the career numbers, Charlie Williams had the better of this cross-role comparison — though era context would sharpen the verdict.