Hayden Birdsong vs. Diego Castillo — Career Comparison

Hayden Birdsong 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 4.77 and 1.438 for Hayden Birdsong. By the career numbers, Diego Castillo had the better of this cross-role comparison — though era context would sharpen the verdict.