Mike Duvall vs. John Jackson — Career Comparison

John Jackson built a career as a starting pitcher and Mike Duvall as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Mike Duvall posted stronger surface numbers — ERA 4.76 and WHIP 1.863 compared to 6 and 2.019 for John Jackson. By the career numbers, Mike Duvall had the better of this cross-role comparison — though era context would sharpen the verdict.