UNDATED (AP)_In what could be a preview for the NBA Western Conference title, Oklahoma City opened a 20-point lead and beat slumping San Antonio 100-88 to climb within a half-game of the West-leading Spurs. San Antonio has lost four of its last eight games.

Russell Westbrook led the way with 27 for the Thunder. Kevin Durant added 25.

Oklahoma City trails San Antonio by a half-game in the standings, but pulled even in the loss column. Oklahoma City would control the tiebreaker if both teams won out because of its better record against the West.

In other NBA action:

— Corey Brewer scored 23 points and got a hand on Anthony Morrow's last-second shot to preserve the Denver Nuggets' 19th straight home win, 95-94 over the Dallas Mavericks. Denver's win was bittersweet, though. Denver's dreams of a deep playoff run might have taken a huge hit when they lost forward Danilo Gallinari to what looked like serious knee injury in the second quarter. Gallinari is scheduled for an MRI on Friday.

— Carlos Boozer had 29 points and 18 rebounds, Nate Robinson made the go-ahead basket with 22 seconds left, and the Chicago Bulls overcame a 16-point deficit to beat the Brooklyn Nets 92-90. Deron (DEHR'-ihn) Williams had 30 points and 10 assists to lead the Nets.