Cardinals 1, Pirates 0: Peter Bourjos hit a two-out walk-off single in the bottom of the ninth inning as St. Louis completed a three-game home sweep of Pittsburgh.

After each team managed just three hits apiece through 8 ½ innings, Mark Melancon (2-4) struck out Matt Adams and Jhonny Peralta to begin the ninth before issuing an eight-pitch walk to Yadier Molina. Jon Jay singled to left moments later and Bourjos sent the Cardinals to their seventh walk-off win of the season two pitches later on a grounder up the middle.

Jay and Bourjos tallied two hits apiece and Trevor Rosenthal (2-6) tossed a scoreless ninth for St. Louis, which stretched its lead in the National League Central to 2 ½ games over Milwaukee and five games over Pittsburgh with its fifth straight victory. Neil Walker went 3-for-3 to put an end to a 4-for-33 slump for the Pirates, who fell to 2-10 over their last 12 road games and trail the Brewers by 2 ½ games for the second wild card.

Pittsburgh starter Edinson Volquez walked Matt Carpenter on four pitches to begin the game and hit consecutive hitters with a pitch in the fourth, but did not yield his first hits until Jay and Bourjos opened the fifth with singles. Volquez departed after Jay walked and advanced to second on a sacrifice bunt to start the seventh, but Russell Martin threw out Jay on a stolen-base attempt and Tony Watson retired Randal Grichuk to end the threat.

St. Louis right-hander Shelby Miller stranded a pair of runners in the second before cruising until the seventh, when he worked around a leadoff double by Walker and intentional walk to Ike Davis to keep the scoreless game intact. Carlos Martinez struck out a pair in the eighth and Rosenthal benefited from a double-play grounder by Martin in the ninth as St. Louis won the season series 11-8.

GAME NOTEBOOK: Volquez, who yielded three singles and two walks in 6 1/3 frames, is 3-0 with a 1.38 ERA over his last six turns and unbeaten over his last eight outings. … Miller allowed three hits and three walks over seven scoreless innings, lowering his ERA in 10 day starts to 2.74 (as opposed to his 4.81 ERA in 18 night appearances). … Reigning National League MVP Andrew McCutchen went 0-for-4, lowering his batting average to .175 in St. Louis in 2014 after entering the season a .343 regular-season hitter there.