OKLAHOMA CITY -- Coming off his worst performance in the playoffs, Kevin Durant couldn't get his shots to fall again. Then he caught a glimpse of his mother dancing around during a timeout and, like magic, the ball started going through the net.

Durant scored 39 points for his best offensive outing of the series, Russell Westbrook had his first playoff triple-double and the Oklahoma City Thunder advanced to the Western Conference finals with a 105-90 win Sunday over Memphis in Game 7.

"I knew she had those dance moves," Durant said. "She used to do it all the time when I was young. She was having fun. I was glad to see that."

Soon enough, he was having fun, too -- and the Thunder are two-stepping into Texas for the franchise's first appearance in the West finals since losing in the NBA finals in 1996 as the Seattle SuperSonics.

Game 1 against the Mavericks is Tuesday night in Dallas.

Durant, the NBA scoring champion the past two seasons, followed the lowest-scoring game of his two postseason appearances with one of his best. He heated up in the second quarter after the entertaining exchange with his mother, put the Thunder in control late in the third, then put it away with a pair of two-handed slams in the fourth.

"Durant is a special player, one of the best players in the NBA," said Memphis star Zach Randolph, who was limited to an inefficient 17 points and 10 rebounds. "The kid is a gym-rat, he works hard. He's one of my favorite players. You've got to give him kudos and give him respect."

Westbrook, criticized throughout the playoffs for taking too many shots, was at his all-around best with 14 points, matching his season-high with 14 assists and producing extra possessions with 10 rebounds. It was only the fifth triple-double in a Game 7, according to the Elias Sports Bureau. Larry Bird, Jerry West, James Worthy and Scottie Pippen also accomplished the feat.

Mike Conley scored 18 points to lead Memphis.

MEMPHIS (90): Mayo 5-12 3-5 14, Randolph 6-15 5-6 17, Gasol 4-10 4-4 12, Conley 7-19 2-2 18, Allen 3-6 1-2 7, Battier 2-6 0-0 4, Arthur 2-6 0-0 5, Young 2-6 0-0 4, Vasquez 2-4 0-0 5, Powe 1-3 0-0 2, Haddadi 1-1 0-0 2, Smith 0-0 0-0 0. Totals-35-88 15-19 90.

OKLAHOMA CITY (105): Durant 13-25 9-9 39, Ibaka 1-4 0-0 2, Perkins 2-4 0-0 4, Westbrook 4-12 6-6 14, Sefolosha 2-5 0-0 4, Collison 3-4 2-2 8, Harden 6-10 1-4 17, Mohammed 3-4 0-0 6, Maynor 1-3 0-0 3, Cook 0-4 0-0 0, Ivey 1-1 0-0 3, Robinson 1-1 2-2 5. Totals-37-77 20-23 105.

3-Point-Memphis 5-15 (Conley 2-3, Arthur 1-1, Vasquez 1-2, Mayo 1-5, Allen 0-1, Battier 0-3), Oklahoma City 11-28 (Harden 4-8, Durant 4-9, Ivey 1-1, Robinson 1-1, Maynor 1-2, Sefolosha 0-3, Cook 0-4). Rebs-Memphis 49 (Randolph 10), Okla City 51 (Collison 12). Assists-Memphis 13 (Conley 6), Okla City 25 (Westbrook 14). Total fouls-Memphis 20, Okla City 19. Technicals-Gasol, Memphis Bench, Ibaka, Westbrook. Att-18,203 (18,203).