Díaz signed with the Arizona Diamondbacks as an international free agent on February 5, 2021. He made his professional debut that year with the Dominican Summer League Diamondbacks. Díaz split the 2022 season between the Single–A Visalia Rawhide and High–A Hillsboro Hops, accumulating a 4–3 record and 4.06 ERA with 99 strikeouts across 19 total games (17 starts).[1]
Díaz spent the majority of the 2023 campaign with Hillsboro, also making 3 starts for the Double–A Amarillo Sod Poodles. In 22 starts with the Hops, he compiled a 2–10 record and 5.03 ERA with 124 strikeouts across 87+2⁄3 innings pitched.[2]
Díaz started the 2024 season with Amarillo before being promoted to the Triple–A Reno Aces.[3] On July 8, 2024, Díaz was selected to the 40-man roster and promoted to the major leagues for the first time.[4] That same day, he faced the Atlanta Braves, pitching six innings of an eventual 5–4 loss.[5]
