Diego Castillo vs. Carson Spiers — Career Comparison

Carson Spiers built a career as a starting pitcher and Diego Castillo as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Diego Castillo posted stronger surface numbers — ERA 3.2 and WHIP 1.153 compared to 5.69 and 1.573 for Carson Spiers. By the career numbers, Diego Castillo had the better of this cross-role comparison — though era context would sharpen the verdict.