Joey Votto's bases-loaded walk in the sixth inning brought home Zack Cosart with the winning run, and Cincinnati claimed a 5-4 decision over Pittsburgh in the middle test of a three-game series.
Cozart and Brandon Phillips both finished with two hits, an RBI and a run scored for the Reds, who have won four of their last five, including the first two in the set.
Mat Latos (9-3) allowed four hits and three runs -- two earned -- over five innings for the win. Aroldis Chapman posted his 23rd save with a scoreless ninth, but worked out of a two-on, no-out jam to wrap up the contest.
Andrew McCutchen collected four hits including a solo homer, and Garrett Jones also went deep for the Pirates, losers of three straight and seven of 10.
A.J. Burnett (4-7) was charged in the setback with 10 hits and five runs -- two earned -- in 5 2/3 frames.
Cozart began the home sixth with a base hit, then advanced on a one-out pinch- single from Cesar Izturis. Chris Heisey's walk loaded the bases, then Votto also drew a base on balls which forced Cozart home to make it 5-3 for Cincinnati.
Travis Snider's pinch-hit double cut Pittsburgh's deficit to one in the eighth.
In the ninth, McCutchen reached on a dribbler to the left of the mound and took second on Chapman's errant throw. Pedro Alvarez was at first and McCutchen at third after Cozart botched a grounder, but Chapman bore down and retired the next three batters to lock up the one-run victory.
After a 77-minute rain delay in the middle of the opening inning, the Reds dented Burnett for four runs thanks to a Jordy Mercer error which allowed Shin-Soo Choo to come home, an RBI single from Phillips, sacrifice fly from Cozart and run-scoring double by Devin Mesoraco.
Jones began the second with his ninth homer of the season, and later in the inning with runners on first and second, Clint Barmes scored when Cozart flubbed his throw to first on a Jose Tabata grounder.
Burnett killed a rally by fanning with the bases loaded and two down in the third, but McCutchen's two-out solo homer in the fourth brought the Bucs within 4-3.