In Montreal, Al Oliver hit his second grand slam in eight days and Bill Gullickson earned his 14th victory as the Expos beat Chicago.
With Montreal trailing, 1-0, Gullickson (14-11) singled to lead off the sixth inning. Steve Trout (9-13) walked Tim Raines and Manny Trillo followed with a single to load the bases. Reliever Mike Proly got the next two outs, but Oliver hit a drive over the right-field fence for his eighth homer of the season and seventh major league grand slam. Oliver also hit a grand slam Aug. 28.
"My feet never touched the ground rounding the bases," he said. "I've thought back to last year's games, and I can't think of any hit that was more timely.
"There's no telling what might have happened if we came away empty. It might have given the Cubs more confidence and maybe they would have blown us away."
Gullickson gave up eight hits, walked two and struck out one before yielding to Bob James with two out in the eighth. James finished up for his third save.
Keith Moreland hit a two-run homer in the eighth after Ron Cey had singled, cutting Montreal's lead to 4-3, but the Expos added insurance runs in the bottom of the inning on Gary Carter's RBI single and a two-run double by pinch hitter Warren Cromartie.