Grant Hartwig vs. Bruce Zimmermann — Career Comparison

Bruce Zimmermann built a career as a starting pitcher and Grant Hartwig as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Grant Hartwig posted stronger surface numbers — ERA 5.14 and WHIP 1.429 compared to 5.64 and 1.460 for Bruce Zimmermann. By the career numbers, Grant Hartwig had the better of this cross-role comparison — though era context would sharpen the verdict.