Michael Kopech vs. John Shaffer — Career Comparison

Michael Kopech built a career as a starting pitcher and John Shaffer 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 4.57 and 1.492 for John Shaffer. By the career numbers, Michael Kopech had the better of this cross-role comparison — though era context would sharpen the verdict.