Bob O'Brien vs. Mike Willis — Career Comparison

Bob O'Brien built a career as a starting pitcher and Mike Willis as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Bob O'Brien posted stronger surface numbers — ERA 3 and WHIP 1.333 compared to 4.59 and 1.524 for Mike Willis. By the career numbers, Bob O'Brien had the better of this cross-role comparison — though era context would sharpen the verdict.