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The Thunder's star player scored the game-winning points deep into double overtime as the defending champions started their NBA title defense with a narrow win over the visiting Rockets.

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

The Rockets' big man top-scored with 39 points and also connected on a career-high five three-pointers.

But Chet Holmgren, who added 28 points, was instrumental together with the game's hero.

"Determination and defence," Gilgeous-Alexander said of their showing. "We know that when we execute on defence we give ourselves a opportunity no matter what's going on—shots, misses, good luck or misfortune. We did enough defence to secure the victory. We're pretty rusty, but it's a good start."

Prior to the game, Oklahoma's title banner was raised at their home court, while the squad were presented with their championship rings.

Oklahoma City beat the Pacers in the previous season's best-of-seven NBA Finals. It was their maiden championship since the franchise moved in 2008 to OKC from Seattle, who had claimed the 1979 crown.

The Pacers will have the opportunity to get some early revenge on Friday when they host the Thunder, while the Rockets return to action on the same day at the Detroit Pistons.

Elsewhere, a huge performance of 43 points, 12 boards and nine assists from the Slovenian star was not enough to prevent his new team the Los Angeles Lakers from suffering a 119-109 loss against the Golden State Warriors.

Miami's star scored 31 points and Stephen Curry added 23 points for the visiting Warriors.

The Lakers were missing the league's top scorer James as he recovers from a back issue.