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Shai Gilgeous-Alexander delivered the game-winning baskets deep into double overtime as the defending champions started their championship campaign with a narrow victory over the visiting Rockets.

The reigning MVP poured in a team-high 35 points, featuring two from the free-throw line with just 2.3 seconds remaining in double OT, giving the champions a winning beginning.

Houston's Alperun Sengun top-scored with 39 points and also hit a personal-best five three-pointers.

But the Thunder's rookie, who contributed 28 points, was instrumental together with the game's hero.

"Determination and defence," Gilgeous-Alexander said of their performance. "We know that when we execute defensively we give ourselves a chance no matter what's going on—shots, missed attempts, good luck or bad luck. We did sufficient defence to get the win. We're pretty rusty, but it's a good start."

Before the tip-off, Oklahoma's championship banner was raised at their home court, while the squad were awarded their title rings.

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

The Pacers will have the opportunity to secure some early revenge on this Friday when they host Oklahoma, while the Houston return to action on the identical day at the Pistons.

In other action, a massive effort of 43 points, 12 rebounds and nine assists from the Slovenian star was not enough to prevent his current team the Los Angeles Lakers from suffering a 119-109 loss against the Golden State Warriors.

Miami's star picked up 31 points and Stephen Curry added 23 points for the visiting Warriors.

Los Angeles were without the league's top scorer LeBron James as he recovers from a back issue.