Jon Lieber vs. Jim Peterson — Career Comparison

Jon Lieber built a career as a starting pitcher and Jim Peterson as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jon Lieber posted stronger surface numbers — ERA 4.27 and WHIP 1.302 compared to 5.27 and 1.665 for Jim Peterson. By the career numbers, Jon Lieber had the better of this cross-role comparison — though era context would sharpen the verdict.