Grant Jackson vs. Zack Spencer — Career Comparison

Zack Spencer built a career as a starting pitcher and Grant Jackson as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Grant Jackson posted stronger surface numbers — ERA 3.46 and WHIP 1.365 compared to 7.04 and 1.565 for Zack Spencer. By the career numbers, Grant Jackson had the better of this cross-role comparison — though era context would sharpen the verdict.