ST. LOUIS — Joel Pineiro may have found himself a home in the St. Louis Cardinals rotation.

Pineiro, stuck in the Boston Red Sox bullpen before his trade to St. Louis on July 30, won for the fourth time in six starts as the St. Louis Cardinals beat the Pittsburgh Pirates 6-2 on Tuesday night.

The Cardinals moved back over .500 with the win and closed to one game behind the Chicago Cubs in the NL Central. The Brewers are ahead of the Cardinals, a half-game behind the Cubs.

Pineiro (4-2) allowed two runs and eight hits in 5 2-3 innings.

"He's got good stuff," pitching coach Dave Duncan said. "As soon as he believes in it as much as I do he'll be a better pitcher.

"He still thinks he has to do more to be a good pitcher and when he realizes that he's not going to be in the fifth inning with 90-some pitches."

Pineiro has a 3.63 ERA in seven starts since joining the Cardinals. As a reliever with the Red Sox, Pineiro had a 5.03 ERA in 31 games.

"I've put my name back on track and I'm reviving myself as a starter," Pineiro said. "That's all I want to do. You keep the damage to a minimum."

Chris Duncan hit a three-run double to back Pineiro and Russell Branyan homered for St. Louis in his first start since being acquired from the Phillies four days earlier.

Matt Morris (8-9) struggled in his second start in St. Louis as a visiting player. Morris, whose 101 wins rank 10th on the Cardinals' career list, lasted five innings and gave up five runs and five hits.

"They were just trying to hit fastballs the other way and sitting on some breaking stuff," Morris said. "We scored two runs and then give up three with two outs, that's tough to take."

Nyjer Morgan and Jose Bautista each drove in a run in the third for the Pirates, who have lost six of seven. Jack Wilson singled twice, giving him six hits the last two games.

But Pittsburgh stranded 10 runners, leaving two on in four innings and the bases loaded in the eighth.

"That game basically boils down to the fact that they took the big at-bat with two outs and the bases loaded in the third inning, and we had several opportunities in need of a two-out hit and weren't able to get it," Pirates manager Jim Tracy said. "When you've got people on, you need to get a hit here or there."