Mike Armstrong vs. Michael Kopech — Career Comparison

Michael Kopech built a career as a starting pitcher and Mike Armstrong as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Mike Armstrong led in walk avoidance (BB%+ 90 vs 58), skill-based run prevention (DICE+ 97 vs 78), and run prevention (ERA+ 110 vs 95). Role difference aside, Mike Armstrong holds a clear edge on every meaningful shared measure.