Trey Burke had 25 points and eight assists, Dwight Powell scored the winning basket on a dunk with 21 seconds left and the Dallas Mavericks, playing without star rookie Luka Doncic, stunned the Oklahoma City Thunder 106-103 on Sunday.
Jalen Brunson had 18 points, Devin Harris added 15 and Dirk Nowitzki -- playing perhaps his final game in Oklahoma City -- grabbed a season-high 13 rebounds to go with seven points for the Mavericks, who were 3-17 over their previous 20 games.
Russell Westbrook had 25 points, 11 rebounds and 11 assists for his 30th triple-double of the season and Paul George had 27 points and 11 rebounds for the Thunder, which had sealed a Western Conference playoff spot Saturday when the Sacramento Kings lost. But Oklahoma City has struggled since the All-Star break, going 7-13.
Dallas led 93-84 after Burke made one of two free throws with 6:50 left, but Oklahoma City used a 14-4 run and went ahead 98-97 with 1:59 left on two free throws by George, the first of six lead changes in the final two minutes.
Burke scored on a tough, driving basket with 1:15 left to put Dallas back up 100-98, but George answered with a 3-pointer with 1:09 left. Brunson hit a 17-foot jumper with 49.1 seconds and the Mavericks went ahead 102-101 before Jerami Grant's layup -- off an inbounds pass from Westbrook -- put Oklahoma City up 103-102 with 32.8 seconds left.
Brunson passed to Powell for the dunk with 21 seconds left and Dallas again took the lead. Dennis Schroder and George each missed a 3-point attempt for the Thunder before Dallas' Ryan Broekhoff made two free throws with 4.2 seconds left to make it 106-103. Westbrook missed a 38-foot shot just before the buzzer.
Steven Adams added 20 points and 15 rebounds and Grant had 14 points for Oklahoma City, while Powell had 11 points and nine rebounds for the Mavericks.
Doncic missed the game with a right thigh contusion.
An 11-0 spurt over 91 seconds of the second quarter -- which included two 3-pointers from Harris -- gave the Mavericks a 51-37 lead with 5:05 left in the half, but Oklahoma City closed the half on a 19-7 run to pull within 58-56.
Mavericks: Coach Rick Carlisle, who played on Virginia's Final Four team in 1984, began his pregame news conference wanting to discuss his alma mater's win over Purdue on Saturday that sent the Cavaliers to the national semifinals for the first time since 1984. ... Nowitzki received a loud ovation when he was introduced as part of the starting lineup. ... Courtney Lee started in place of Doncic. ... Harris received a technical foul with 11:48 left for arguing an out of bounds call.
Thunder: Westbrook, who already has served a one-game suspension for accumulating too many technical fouls, picked up another one in the third quarter, his 17th of the season. Another technical would result in a second one-game suspension. ... Westbrook's triple-double was the 134th of his career. He's four behind Magic Johnson (138) for second place in NBA history in that category.
Mavericks: Host Philadelphia on Monday to begin a three-game homestand.
Thunder: Host the Los Angeles Lakers (without LeBron James) on Tuesday.