Bill Day vs. Michael Kopech — Career Comparison

Michael Kopech built a career as a starting pitcher and Bill Day as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Michael Kopech posted stronger surface numbers — ERA 4.14 and WHIP 1.333 compared to 4.66 and 1.802 for Bill Day. By the career numbers, Michael Kopech had the better of this cross-role comparison — though era context would sharpen the verdict.