Michael Kopech vs. Dan O'Brien — Career Comparison

Michael Kopech built a career as a starting pitcher and Dan O'Brien 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 5.9 and 1.931 for Dan O'Brien. By the career numbers, Michael Kopech had the better of this cross-role comparison — though era context would sharpen the verdict.