Zach Duke vs. John Perkovich — Career Comparison

Zach Duke built a career as a starting pitcher and John Perkovich as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Zach Duke posted stronger surface numbers — ERA 4.31 and WHIP 1.474 compared to 7.2 and 1.600 for John Perkovich. By the career numbers, Zach Duke had the better of this cross-role comparison — though era context would sharpen the verdict.