CHICAGO — Jack Wilson didn't have much of a day in the field and his contribution to the offense was a couple of fly balls.

The Pittsburgh shortstop went 0-for-6 with an error Tuesday night, but his first sacrifice fly in the ninth inning tied the game and his second came with the bases loaded in the 15th to give the Pirates a 4-3 victory over the Chicago Cubs.

"I think it was by far the worst game of my career and it ended up being two nice sac flies to tie the game and end the game," Wilson said.

Ryan Theriot had three hits and drove in two runs for the Cubs, who lost for the second time in 10 games and had a five-game winning streak snapped.

Ronny Paulino led off the 15th with a single off reliever Neal Cotts (0-1). Jose Bautista followed with a sacrifice bunt that first baseman Derrek Lee fielded, but his throw to second was off the mark. A throwing error by catcher Michael Barrett sent Paulino to third. Pinch-hitter Zach Duke struck out, but Cotts hit Ryan Doumit to load the bases. Wilson followed with his sacrifice fly to left-center.

"It wasn't the best major league game. We had chances, we just didn't take advantages of them," Cubs manager Lou Piniella said in a brief postgame news conference. Jonah Bayliss (3-2) pitched three scoreless innings of relief for the victory and Salomon Torres worked the 15th for his 10th save. The Pirates won despite leaving 17 runners on in the game that lasted 4 hours, 39 minutes.

"It took everything we possibly had to get the four runs," said Pirates manager Jim Tracy, who was ejected in the seventh inning for arguing a play at second.