Yilber Díaz vs. Ron Willis — Career Comparison

Yilber Díaz built a career as a starting pitcher and Ron Willis as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Ron Willis posted stronger surface numbers — ERA 3.32 and WHIP 1.544 compared to 4.31 and 1.468 for Yilber Díaz. By the career numbers, Ron Willis had the better of this cross-role comparison — though era context would sharpen the verdict.