Michael Kopech vs. Jack O'Connor — Career Comparison

Michael Kopech built a career as a starting pitcher and Jack O'Connor as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jack O'Connor led in walk avoidance (BB%+ 82 vs 58), skill-based run prevention (DICE+ 86 vs 78), and home run suppression (HR9+ 89 vs 83). Michael Kopech held the edge in run prevention (ERA+ 95 vs 80). Keeping the role difference in mind, the edge still goes to Jack O'Connor.