Diaz (finger) was reinstated from Triple-A Reno's 7-day injured list Thursday and struck out six while allowing three runs on four hits and two walks over five innings in his return to the club's rotation.
Diaz was placed on Reno's IL on Aug. 7 with a blister on his right hand but missed just over a week of action before making his return. The 24-year-old righty acquitted himself well in four starts with the big club earlier this season, but he could struggle to get another look with the Diamondbacks in 2024 if all of Zac Gallen, Merrill Kelly, Brandon Pfaadt, Eduardo Rodriguez, Jordan Montgomery and Ryne Nelson are all able to stay healthy down the stretch.