John Halama vs. Jack O'Connor — Career Comparison

John Halama 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. John Halama led in walk avoidance (BB%+ 129 vs 82), run prevention (ERA+ 105 vs 80), and skill-based run prevention (DICE+ 96 vs 86). Jack O'Connor held the edge in strikeout rate (K%+ 85 vs 76). Role difference aside, John Halama holds a clear edge on every meaningful shared measure.