Bracho was optioned to Triple-A Reno on Saturday, Nick Piecoro of The Arizona Republic reports.
Bracho will return to Reno for the second time since the start of July, though he has a 1.72 ERA and 0.83 WHIP with 22 strikeouts across 15.2 innings with the Diamondbacks this season. The 25-year-old seems likely to rejoin Arizona at some point given his major-league success thus far in 2018.