John Costello vs. Cal Quantrill — Career Comparison

Cal Quantrill built a career as a starting pitcher and John Costello as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. John Costello led in run prevention (ERA+ 135 vs 101), strikeout rate (K%+ 99 vs 82), and home run suppression (HR9+ 115 vs 102). Cal Quantrill held the edge in walk avoidance (BB%+ 107 vs 91). Role difference aside, John Costello holds a clear edge on every meaningful shared measure.