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The Thunder's star player scored the game-winning points late in a second overtime period as the Oklahoma City Thunder opened their championship campaign with a 125-124 win over the visiting Rockets.

Last season's MVP poured in 35 points, featuring two from the free-throw line with just 2.3 seconds left in double OT, giving the titleholders a positive start.

The Rockets' big man led all scorers with 39 points and also connected on a personal-best five three-pointers.

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

"Determination and defense," SGA said of their performance. "We know that when we execute on defence we give ourselves a opportunity no matter what's going on—shots, misses, fortune or misfortune. We did enough defensive work to get the win. We're still shaking off rust, but it's a positive beginning."

Prior to the game, the team's championship banner was unveiled at their arena, while the squad were awarded their title rings.

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

Indiana will have the opportunity to get some payback on this Friday when they host the Thunder, while the Houston return to action on the identical day at the Detroit Pistons.

Elsewhere, a huge effort of 43 points, 12 boards and nine assists from Luka Doncic was not enough to prevent his current team the Los Angeles Lakers from suffering a 119-109 defeat against the Warriors.

Jimmy Butler picked up 31 points and Golden State's sharpshooter added 23 points for the visiting Warriors.

Los Angeles were missing the NBA's all-time leading scorer James as he recovers from sciatica.