The Diamondbacks optioned Bratt to Triple-A Reno on Sunday.
Bratt started the second game of Saturday's doubleheader versus the Giants, coughing up three runs on three hits and two walks while striking out two over 4.1 innings. Because he was on the roster as the 27th man, the southpaw is eligible to be recalled at any time, putting Bratt in the mix to start a game this weekend in Houston.