PHOENIX — The Arizona Diamondbacks have recalled top-ranked pitching prospect Yilber Diaz from Triple-A Reno and optioned reliever J.P. Feyereisen, Arizona Sports’ John Gambadoro reported.
The Diamondbacks’ bullpen has been taxed this week with back-to-back extra-inning losses to the Tampa Bay Rays, paired with “fatigue” that has limited Justin Martinez. Long reliever Ryne Nelson threw 54 pitches on Thursday and will be rested for a few days.
Feyereisen earned the loss on Thursday evening, and the Diamondbacks are set to begin a difficult portion of the schedule starting with the Atlanta Braves at Chase Field on Friday.
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Diaz returns to the big leagues after making five starts with the Aces this season. His last appearance was on Sunday, a game he entered with a 4.32 ERA before allowing six runs.
The 24-year-old right-hander made his MLB debut last season, the culmination of a remarkable rise from washing windshields on the streets of Peru to striking out big league hitters.
Diaz made seven appearances with four starts, working a 3.81 ERA in 28.1 innings. He started his career with back-to-back outings of six innings and one earned run. One of those outings came against the Braves.
In the minor leagues last year, he threw 104.1 innings with a 3.80 ERA and 140 strikeouts while working in hitter-friendly environments.
He’s got a mid-to-upper 90s heater with a nasty curveball and slider. Continuing to improve at limiting walks will be critical in his development.
Enjoy Yilber Diaz carving up Julio Rodriguez ? pic.twitter.com/amjSEN0IdJ
— Reno Aces (@Aces) March 7, 2025
Diaz is No. 4 on the Diamondbacks’ MLB Pipeline prospects list.
Feyereisen only made two appearances for the Diamondbacks, including a scoreless inning at Wrigley Field last weekend.
The Diamondbacks and Braves begin their three-game series at 6:40 p.m. on Friday night. Zac Gallen will pitch against Atlanta ace Chris Sale.
Catch the game on 98.7 and the Arizona Sports app.
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