Michael Kopech vs. Mark Williamson — Career Comparison

Michael Kopech built a career as a starting pitcher and Mark Williamson as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Mark Williamson led in walk avoidance (BB%+ 126 vs 58), skill-based run prevention (DICE+ 101 vs 78), and run prevention (ERA+ 113 vs 95). Michael Kopech held the edge in strikeout rate (K%+ 100 vs 88). Role difference aside, Mark Williamson holds a clear edge on every meaningful shared measure.