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Shai Gilgeous-Alexander delivered the game-winning points deep into a second overtime period as the defending champions opened their championship campaign with a narrow win over the visiting Rockets.

The reigning MVP poured in a team-high 35 points, featuring two clutch free throws with just mere seconds remaining in double OT, securing the champions a positive start.

Houston's Alperun Sengun led all scorers with a game-high 39 and also connected on a career-high five shots from beyond the arc.

But Chet Holmgren, who contributed 28 points of his own, played a major role alongside the game's hero.

"Determination 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—makes, misses, fortune or bad luck. We did enough defence to get the win. We're still shaking off rust, but it's a good start."

Before the game, Oklahoma's title banner was raised at their home court, while the players were awarded their title rings.

The Thunder beat the Indiana Pacers in the previous season's championship series. It was their maiden championship since the franchise moved in 2008 to OKC from Seattle, who had claimed the 1979 title.

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

Elsewhere, a huge effort of 43 points, 12 rebounds and nine dimes from Luka Doncic was not enough to prevent his current team the Los Angeles Lakers from falling to a 119-109 loss against the Golden State Warriors.

Jimmy Butler picked up 31 points and Stephen Curry added 23 points for the road team.

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