Charlie Kerfeld vs. George Mack — Career Comparison

George Mack 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 posted stronger surface numbers — ERA 4.2 and WHIP 1.572 compared to 7.19 and 1.890 for George Mack. By the career numbers, Charlie Kerfeld had the better of this cross-role comparison — though era context would sharpen the verdict.