The Diamondbacks outrighted Castellanos to Triple-A Reno on Friday.
As expected, Castellanos cleared waivers after Arizona designated him for assignment Aug. 11. Since he had been previously outrighted, Castellanos could have elected free agency, but he'll instead stick around in the organization with the hope of earning a call-up to Arizona later on this season. Castellanos worked out of the bullpen for his seven appearances with the big club earlier in 2024 but has been a regular member of the rotation at Reno, with whom he's compiled a 4.39 ERA and 1.24 WHIP across 67.2 innings over 15 outings (14 starts).