Sean Marshall (2-3) escaped the threat, and Aroldis Chapman struck out three in the ninth for his ninth save in 12 tries, celebrating the three-hitter with a pair of somersaults in front of the mound. Chapman had blown two of his last four save chances by giving up homers.
Not what the Brewers cared to see. Green was on deck at the final out, but said he didn't notice Chapman's forward rolls.
Told what happened, Green said: ''I've never seen that. Two somersaults? That's tough.''
Arroyo recovered from one of his worst starts: only four innings in a 7-1 loss in Cleveland last Wednesday. He got several impressive defensive plays behind him to keep his no-hitter intact into the eighth.
The futility felt familiar to the Brewers, who had been held to one run in three of their previous four games. Their past nine losses have come by two runs or fewer.
Milwaukee's Marco Estrada returned from the disabled list and fanned a career-high 12 batters in six innings, but gave up Bruce's 17th homer in the sixth.
For the second night in a row, a pitcher set a career high in strikeouts at hitter-friendly Great American Ball Park. Cincinnati's Mat Latos fanned 13 in a 3-1 complete-game victory in the series opener on Monday.
Estrada had been on the disabled list since May 24 with a strained right thigh. He made two rehab starts at Triple-A and came back as sharp as he's been all season.
The right-hander fanned Zack Cozart on a 91-mph fastball to open the Reds' first inning, and kept going. He struck out six of the first nine he faced, and had 10 strikeouts, a career high, through only five innings.
Estrada gave up a double by Joey Votto in the sixth, a single by Brandon Phillips and Bruce's drive, which made it 64 consecutive games at Great American with at least one homer. It's the longest such streak since Coors Field had 80 straight game with one from 2002 to 2003, according to STATS LLC.
NOTES: Zack Greinke starts the final game of the series for Milwaukee against Homer Bailey. ... Dr. Henry Heimlich presented a life-saving award to Reds 3B Todd Frazier before the game. Frazier saved a choking restaurant patron during a series in Pittsburgh last month. ...