CHICAGO (AP) -- Montreal manager Felipe Alou has a new batch of pitchers to choose from, and so far, so good.

Michael Barrett hit a game-tying, two-run single in the seventh inning and drew a bases-loaded walk in the 11th Sunday to lead the Expos over the Chicago Cubs 4-3.

Anthony Telford (5-3) pitched a hitless inning and Brad Rigby, called up June 17 from Triple-A Ottawa, got the final out in the 11th for his first save with the Expos.

With the game tied at 3, Vladimir Guerrero hit a broken-bat single off Daniel Garibay (1-3) in the 11th and advanced on Lee Stevens' groundout.

Garibay threw a wild pitch, then walked Geoff Blum, Chris Widger and Barrett, forcing in the go-ahead run.

"I couldn't find my control and I just don't know what happened," Garibay said through an interpreter.

"Today, Garibay just didn't throw strikes," said Cubs manager Don Baylor, whose bullpen was shorthanded because of repeated use.

Alou called on Julio Santana, acquired from Triple-A Pawtucket and signed Sunday, Scott Forster, who joined the team Saturday from Ottawa, and then Rigby in the 11th.

"I can't even start to say what was going through my head," Forster said. "I never knew if this would ever happen (getting to the big leagues) or where."

Santana gave up a one-out double to Mark Grace but he was stranded at third as Rigby got Joe Girardi to ground out and end the game.

"I tried not to think about the situation," Rigby said. "When you do that, the outcome might not be quite the same."

"I like this truckload of pitchers better than any other truckload of pitchers we've received yet," Alou said. "They got three big outs."

The biggest outs might have been in the Cubs 10th. With one out and Eric Young at first, Brant Brown flied out to center field. Young, thinking the ball had been trapped by Peter Bergeron, was nearly at second base and was thrown out for an inning-ending double play.

Young was looking at second base umpire John Shulock for a signal but it was third base umpire Rocky Roe who made the call.

"Normally, you look at the second base umpire, you don't look at third," Young said. "I think there was confusion about who was going to call it. I'm looking at the umpire right there (at second). Then I looked at third base and his call was delayed."

Cubs starter Jon Lieber gave up three runs and six hits in seven innings. He has worked at least seven innings in his last seven starts.

Javier Vazquez allowed three runs on eight hits in six innings, striking out seven and walking none.

Guerrero hit a sacrifice fly in the first to score Bergeron, who had a leadoff double.

Sammy Sosa tied it in the bottom half with his 20th homer, and Willie Greene hit a two-run double in the fourth for a 3-1 lead.

Barrett singled in the seventh following a leadoff single by Guerrero and Blum's walk.

"Everytime I came up, I kept laughing to myself," Barrett said. "It felt good to have an opportunity. It felt like it was my day."

Game notes
Sosa's homer was his first since June 9 when he hit a game-tying two-run homer in the ninth against the White Sox. He also singled in the fifth and is five hits shy of reaching 1,500. ... Montreal designated RHP Matt Skrmetta for assignment and signed RHP Julio Santana. ... The Expos are 2-0 in extra inning games.