Charlie Kerfeld vs. John O'Donoghue — Career Comparison

John O'Donoghue built a career as a starting pitcher and Charlie Kerfeld as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Charlie Kerfeld led in home run suppression (HR9+ 170 vs 95), strikeout rate (K%+ 112 vs 74), and run prevention (ERA+ 116 vs 88). John O'Donoghue held the edge in walk avoidance (BB%+ 121 vs 81). Role difference aside, Charlie Kerfeld holds a clear edge on every meaningful shared measure.