Mike Duvall vs. Zack Spencer — Career Comparison

Zack Spencer 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 7.04 and 1.565 for Zack Spencer. By the career numbers, Mike Duvall had the better of this cross-role comparison — though era context would sharpen the verdict.