The Oklahoma City Thunder completed the four-game sweep of the defending NBA Champion Dallas Mavericks Saturday night with a 103-97 victory.

James Harden scored 15 of his 29 points in the fourth quarter to help the Thunder rally from 13-down with less than 10 minutes remaining.

''I got into attack mode. I was determined to make plays,'' Harden said.

The Thunder took the lead, and didn’t relinquish it, when Russell Westbrook stole the ball from Dirk Nowistzki and passed to Serge Ibaka for a two-handed dunk which made it 92-91 with 5:17 left.

Kevin Durant finished with 24 points, while Westbrook and Derek Fisher each added 12.

Oklahoma City will play the winner of the series between the Los Angeles Lakers and Denver Nuggets. The Lakers lead that first-round series 2-1 going into Game 4 on Sunday night in Denver.

It was the first four-game postseason sweep for the Oklahoma City franchise since 1996, when they were still the Seattle Super Sonics and swept the Houston Rockets in the second round.

The Mavericks became the second defending champion in five years to be swept in the first round, joining Miami who lost in four games to Chicago in 2007.

Dallas had never been swept in a best-of-seven series, and the Mav’s hadn’t lost four playoff games in a row since 2006 against the Heat.