Jim Peterson vs. Bruce Zimmermann — Career Comparison

Bruce Zimmermann 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 5.64 and 1.460 for Bruce Zimmermann. By the career numbers, Jim Peterson had the better of this cross-role comparison — though era context would sharpen the verdict.