Frank Herrmann vs. Jerry Koosman — Career Comparison

Jerry Koosman built a career as a starting pitcher and Frank Herrmann as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jerry Koosman led in strikeout rate (K%+ 109 vs 69), run prevention (ERA+ 110 vs 88), and home run suppression (HR9+ 95 vs 81). Frank Herrmann held the edge in walk avoidance (BB%+ 171 vs 102). Role difference aside, Jerry Koosman holds a clear edge on every meaningful shared measure.