Scouting Report: Yilber Diaz
Arizona Diamondbacks | SP
Overall
Summary
Yilber Diaz is a minor league pitcher (RHP, No. 21 prospect) with the Arizona Diamondbacks organization. In April 2026, he was named minor league pitcher of the month after an outstanding performance with the Aces (Triple-A). He allowed no runs in 9 of his 10 appearances with a 0.66 ERA, ranking second among all Triple-A relievers. Diaz features the fastest average fastball velocity (95.3 MPH) among prospect comparables and has improved his strike zone control significantly in 2026, decreasing his walk rate substantially from spring training. Despite previous struggles and uncertainty about his future, Diaz has worked exceptionally hard to prepare for his opportunity. He would be a strong addition to the Diamondbacks bullpen.
Strengths
- Exceptional April performance with 0.66 ERA in Triple-A
- Allowed no runs in 9 of 10 appearances
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