Mike Mussina vs. Jim Peterson — Career Comparison

Mike Mussina 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. Mike Mussina posted stronger surface numbers — ERA 3.68 and WHIP 1.200 compared to 5.27 and 1.665 for Jim Peterson. By the career numbers, Mike Mussina had the better of this cross-role comparison — though era context would sharpen the verdict.