Brayan Pena's second career pinch-homer started Cincinnati's big eighth-inning rally and swept the Reds to over the Milwaukee Brewers 8-3 Thursday night.
The Reds hit three homers in all as they pulled within 6 1/2 games of the NL Central leaders.
Tucker Barnhart led off the fifth with his first career homer.
Todd Frazier added a two-run drive in the sixth off Marco Estrada, who gave up six hits and four walks in six innings.
Pena had homered during a 9-4 loss to the Cubs on Wednesday night.
He hit for Bailey with the score tied at 3 in the eighth and connected on the first pitch from Jim Henderson (2-1) for a two-run homer.
Cincinnati sent 11 batters to the plate while scoring five times during the inning.