Bray pitched 1 2/3 innings of perfect relief and reported feeling good.
"Dayton was a lot of fun. I was able to get out there and get a couple innings and get a lot of good work," Bray said on Tuesday while in the Reds' clubhouse. "It was definitely a good thing for me."
Bray is expected to continue his rehab assignment at Triple-A Louisville on Thursday and Friday. It will be an important test to show that he can pitch on back-to-back days.
"That's my job here, being able to pitch two, three or four days in a row," Bray said. "That will be a big milestone for me."
Originally bothered by the groin injury during Spring Training, Bray pitched only five games in the regular season before he went on the DL. He changed his pitching mechanics to improve the groin injury, which led to the back trouble.
"By the time we figured out what I had done mechanically, it was almost too late," Bray said. "We fixed that problem, then I wrenched my back again and had to take six days off. But once I was able to get throwing again, things have been moving pretty quickly."
Reds manager Dusty Baker was anticipating how Bray's return could benefit his bullpen.
"You'd certainly like to have more than one left-hander in the bullpen," Baker said. "Even though we have two, one of them is closing."