CHICAGO (AP) -- Derrek Lee hit a grand slam and a three-run homer Thursday night for a career-high seven RBIs, and the Chicago Cubs opened an 11-game homestand by beating the Milwaukee Brewers 9-5.

Lee drove his 10th career grand slam off reliever Chris Smith in the fourth after connecting for a three-run shot off starter Seth McClung in the first. Jake Fox and Geovany Soto also had solo shots off McClung (3-2), who was making just his second start of the season.

Ryan Dempster (5-5) got his first win since May 30 and improved his career record against the Brewers to 10-3. He gave up four runs -- three earned -- and eight hits in 6 2-3 innings, including Mike Cameron's 13th homer in the second and Prince Fielder's 21st in the sixth. He left after Ryan Braun's RBI single in the seventh.