The Milwaukee Brewers open a three-game weekend series against the Houston Astros at Miller Park tonight. They're coming off a series in which they took 2 of 3 from the Los Angeles Dodgers. Ben Sheets (4-6) pitches for the Brewers. Roy Oswalt (11-8) goes for the Astros. The Brewers head into the weekend trailing the Astros by 4 1/2 games for fourth place in the NL Central.