Oklahoma City Thunder forward Kevin Durant (L) and guard Russell Westbrook (0) celebrate from the bench after another teammate scored a 3-point shot late in the fourth quarter against the Memphis Grizzlies in Game 7 of their second round Western Conference NBA basketball playoffs in Oklahoma City, Oklahoma May 15, 2011. [Photo/Agencies]

OKLAHOMA CITY, Oklahoma - Kevin Durant bounced back from his worst playoff performance ever to score 39 points and Russell Westbrook had his first playoff triple-double as the Oklahoma City Thunder advanced to the Western Conference finals with a 105-90 victory over the Memphis Grizzlies in Game 7 Sunday.

The Thunder will start the Western Conference finals Tuesday against the Dallas Mavericks.

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 an 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. 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.

Mike Conley led Memphis with 18 points, and Zach Randolph was limited to an inefficient 17 points and 10 rebounds. Randolph averaged 28.3 points and 14.7 rebounds in the Grizzlies' three wins in the series.