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The Thunder's star player delivered the game-winning baskets deep into double overtime as the defending champions started their championship campaign with a 125-124 victory over the Houston Rockets.

Last season's MVP scored a team-high 35 points, including two clutch free throws with just mere seconds remaining in double OT, giving the titleholders a positive start.

The Rockets' big man led all scorers with a game-high 39 and also hit a career-high five three-pointers.

But the Thunder's rookie, who added 28 points, was instrumental alongside the game's hero.

"Determination and defense," SGA said of their performance. "We know that when we execute defensively we give ourselves a opportunity no matter what's going on—shots, missed attempts, good luck or misfortune. We did sufficient defence to get the win. We're still shaking off rust, but it's a good start."

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

The Thunder beat the Indiana Pacers in the previous season's best-of-seven NBA Finals. It was their first title since the franchise relocated in 2008 to OKC from Seattle, who had won the 1979 title.

Indiana will have the opportunity to secure some payback on Friday when they face the Thunder, while the Rockets return to action on the identical day at the Pistons.

In other action, a massive effort of 43 points, 12 boards and nine dimes from Luka Doncic was not enough to stop his new team the Los Angeles Lakers from suffering a 119-109 loss against the Warriors.

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

Los Angeles were without the NBA's all-time leading scorer James as he is recovering from a back issue.