Josh Giddey has produced a double-double to help Oklahoma City Thunder beat the San Antonio Spurs 102-90 as they compete for a berth in the NBA's Western Conference play-in tournament.

With their leading scorer Shai Gilgeous-Alexander rested for injury management, the youthful Thunder used a balanced effort on offence to get the job done.

Australian star Giddey had 15 points 11 rebounds and five assists while Jalen Williams scored 21 points and Ousmane Dieng came off the bench to add a career-high 17 for the Thunder, who won their second in a row and fifth in six games.

Oklahoma City tied Utah Jazz for 10th place in the West at 33-35, but the Thunder hold the tiebreaker after winning theie season series 2-1.

Coming off a 110-96 victory in New Orleans on Saturday, the Thunder rested All-Star Gilgeous-Alexander, who has missed 11 games this season and recently returned from an abdominal strain.

The 20-year-old Giddey is averaging 16.3 points this season and 6.2 assists in his second NBA season.

"It's good to win when Shai doesn't play as well," Jalen Williams said.

"Just kind of lets us know that we are doing the right things and playing hard in that way. I think we're doing a good job kind of staying together. I think that's been our biggest thing through the ups and downs.

"When everybody is scoring, it makes us harder to guard. Regardless of how we shot, we were able to move the ball really well, especially in key moments of the game."

San Antonio's Zach Collins had 23 points and 11 rebounds for his ninth career double-double. Devonte' Graham added 20 points.

The Spurs (17-50) are closing out their worst season since finishing 20-62 in 1997, the season before they selected Tim Duncan with the No.1 pick.

with AAP