Miami and Oklahoma City, the last two undefeated teams in the NBA this season, both lost for the first time Monday as the reigning champion Dallas Mavericks and Atlanta Hawks celebrated triumphs. The Mavericks defeated the visiting Thunder 100-87, improving to 2-4 and avenging a loss at Oklahoma City last week, while the hosts Heat fell 100-92 to the Hawks despite a game-high 28 points from Miami's LeBron James. Miami and Oklahoma City still share the NBA's best record at 5-1 after nine days of a season that was shortened to 66 games per club by a contract dispute between players and team owners. At Dallas, German star Dirk Nowitzki scored 26 points and grabbed six rebounds to power the Mavericks while Shawn Marion added 17 points, Jason Terry added 15 and Vince Carter contributed 14. Jason Kidd had a game-high nine assists for Dallas and Ian Mahinmi had a game-high nine rebounds for the Mavericks. Reigning NBA scoring champion Kevin Durant led the Thunder with 27 points while Russell Westbrook added 18 points and eight rebounds. At Miami, Joe Johnson scored 21 points and Al Horford added 16 points and nine rebounds to power the Hawks, who improved to 4-1, just behind Miami in the Southeast division. Tracy McGrady added 16 points, seven rebounds and four assists for Atlanta. Behind James, the Heat were led by Chris Bosh with 19 points and Dwyane Wade with 12 points and a game-high 10 assists. T-Wolves 106, Spurs 96: San Antonio Spurs playmaker Manu Ginobili has been sidelined indefinitely with a broken left hand after suffering the injury Monday in a loss at Minnesota. Ginobili, a guard from Argentina, suffered the injury in the second quarter when he fouled the Timberwolves' Anthony Tolliver while moving to make a shot. He suffered a break below his pinky finger. The victory was Minnesota's first over the Spurs in 17 meetings between the clubs and only the second in their past 23 games against each other. The T-Wolves improved to 2-3 one night after beating Dallas for their first victory. Suns 102, Warriors 91: Steve Nash scored 13 of his 21 points in the fourth quarter and the rookie Markieff Morris added 16 points to lead Phoenix at home. Monta Ellis had 18 points for Golden State. Celtics 100, Wizards 92: Ray Allen scored 11 of his 27 points in the fourth quarter and host Boston won for the second straight night over Washington. Andray Blatche led the Wizards (0-5) with 28 points. In other games it was: Pistons 89, Magic 78; Jazz 94, Hornets 90; Nuggets 91, Bucks 86; Indiana 108, New Jersey 94; Toronto 90, New York 85.