Martinez (elbow) will begin a rehab assignment at Single-A Visalia on Tuesday, MLB.com reports.
Martinez participated in a camp game Friday and reportedly hit 100-plus mph on his four-seamer. The recent upheaval in the Diamondbacks' bullpen -- Paul Sewald was removed as closer and the club is using a committee approach -- indicates Martinez could get back to being the team's closer. That may not happen in 2026, but Martinez should get an opportunity to show his stuff in September.