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Shai Gilgeous-Alexander scored the decisive points deep into double overtime as the Oklahoma City Thunder started their championship campaign with a narrow win over the visiting Rockets.

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

Houston's Alperun Sengun led all scorers 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 alongside match-winner Gilgeous-Alexander.

"Grit and defence," SGA said of their showing. "We know that when we execute on defence we give ourselves a opportunity no matter what's going on—shots, missed attempts, good luck or misfortune. We did enough defensive work to secure the victory. We're still shaking off rust, but it's a good start."

Prior to the game, Oklahoma's title banner was unveiled at their home court, while the squad were awarded their title rings.

Oklahoma City defeated the Indiana Pacers in last season's best-of-seven NBA Finals. It was their first title since the franchise moved in 2008 to Oklahoma City from Seattle, who had won the 1979 title.

Indiana will have the chance to get some early revenge on this Friday when they face Oklahoma, while the Rockets return to action on the identical day at the Pistons.

Elsewhere, a huge effort of 43 points, 12 rebounds and nine dimes from Luka Doncic was insufficient to prevent his current team the Los Angeles Lakers from suffering a 119-109 defeat against the Warriors.

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

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