J. C. Mejia vs. Jim Peterson — Career Comparison

J. C. Mejia 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. Jim Peterson posted stronger surface numbers — ERA 5.27 and WHIP 1.665 compared to 8.32 and 1.697 for J. C. Mejia. By the career numbers, Jim Peterson had the better of this cross-role comparison — though era context would sharpen the verdict.