Bracho was optioned to Triple-A Reno on Friday, Bob McManaman of The Arizona Republic reports.
Bracho lost out on the final bullpen spot to Andrew Chafin despite having a better ERA (3.68 to 6.10) over 5.1 innings this spring. Manager Torey Lovullo says the competition was close, but ultimately elected to have the young right-hander continue his development in the minors. "Because of the way Bracho was really starting to attack hitters and getting quick, easy outs, as a group we really started taking notice," Lovullo said. The 24-year-old will look to build upon his 2016 campaign at Reno, when he posted a 4.81 over 36 relief appearances. He'll likely be among the first relievers to get a call-up if an extra arm is needed.