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Shai Gilgeous-Alexander delivered the decisive baskets late in double overtime as the defending champions started their championship campaign with a 125-124 win over the visiting Rockets.

Last season's MVP poured in 35 points, featuring two clutch free throws with just mere seconds left in double OT, securing the titleholders a positive start.

Houston's Alperun Sengun top-scored with a game-high 39 and also connected on a personal-best five three-pointers.

But the Thunder's rookie, who added 28 points of his own, played a major role together with match-winner Gilgeous-Alexander.

"Grit and defence," SGA commented of their performance. "We know that when we execute on defence we give ourselves a chance no matter what's going on—makes, misses, good luck or misfortune. We did sufficient defensive work to secure the victory. We're pretty rusty, but it's a good start."

Before the tip-off, Oklahoma's championship banner was unveiled at their arena, while the players were presented with their title rings.

The Thunder beat the Indiana Pacers in last season's best-of-seven NBA Finals. It was their maiden championship since the team relocated in 2008 to OKC from Seattle, who had won the 1979 crown.

The Pacers will have the chance to get some early revenge on Friday when they host Oklahoma, while the Rockets are back on court on the identical day at the Detroit Pistons.

Elsewhere, a huge effort of 43 points, 12 boards and nine assists from the Slovenian star was insufficient to stop his new team the Lakers from suffering a 119-109 defeat against the Warriors.

Jimmy Butler scored 31 points and Golden State's sharpshooter chipped in 23 for the road team.

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