Geoff Blum hit a tiebreaking homer in the seventh inning and Miguel Tejada connected and had a season-high five RBIs, helping the Houston Astros overcome an injury to ace Roy Oswalt for an 11-6 victory over the Chicago Cubs on Tuesday night. Jeff Keppinger had four hits and drove in three runs as the Astros snapped the Cubs five-game winning streak and ended its own three-game losing streak.