Don Cooper vs. Don Kaiser — Career Comparison

Don Kaiser built a career as a starting pitcher and Don Cooper as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Don Kaiser posted stronger surface numbers — ERA 4.15 and WHIP 1.458 compared to 5.27 and 1.723 for Don Cooper. By the career numbers, Don Kaiser had the better of this cross-role comparison — though era context would sharpen the verdict.