Juwan Howard added 12 points and 10 rebounds for the Rockets, who have won six of their last seven games.
The Rockets are in the postseason for the first time since the 2004-2005 season.
Houston lost Chuck Hayes to a shoulder injury early in the game and Howard suffered a knee injury late in the game.
Michael Redd scored 26 points for the Bucks, who have lost three straight and 13 of their last 14 road games. Charlie Bell added 20 points, Ruben Patterson 16 points and Brian Skinner 11 rebounds for Milwaukee.
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