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Shai Gilgeous-Alexander scored the game-winning points deep into a second overtime period as the defending champions opened their NBA title defense with a narrow win over the visiting Rockets.

The reigning MVP poured in 35 points, including two from the free-throw line with just 2.3 seconds left in the second overtime, giving the titleholders a winning beginning.

Houston's Alperun Sengun top-scored with a game-high 39 and also connected on a personal-best five shots from beyond the arc.

But Chet Holmgren, who added 28 points, played a major role together with match-winner Gilgeous-Alexander.

"Grit and defence," Gilgeous-Alexander commented of their showing. "We know that when we do it defensively we give ourselves a chance no matter what's going on—shots, misses, fortune or misfortune. We did sufficient defensive work to get the win. We're pretty rusty, but it's a positive beginning."

Prior to the game, the team's title banner was raised at their home court, while the players were awarded their title rings.

Oklahoma City defeated the Pacers in the previous season's championship series. It was their maiden championship since the franchise moved in 2008 to Oklahoma City from Seattle, who had claimed the 1979 title.

Indiana will have the chance to secure some payback on this Friday when they host the Thunder, while the Rockets are back on court on the identical day at the Pistons.

In other action, a huge performance of 43 points, 12 boards and nine assists from Luka Doncic was not enough to stop his new team the Lakers from suffering a 119-109 loss against the Golden State Warriors.

Jimmy Butler picked up 31 points and Stephen Curry added 23 points for the visiting Warriors.

Los Angeles were missing the league's top scorer LeBron James as he recovers from a back issue.