John Costello vs. Steve Sparks — Career Comparison

Steve Sparks 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 90), strikeout rate (K%+ 99 vs 77), and home run suppression (HR9+ 115 vs 100). Role difference aside, John Costello holds a clear edge on every meaningful shared measure.