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Shai Gilgeous-Alexander scored the winning points deep into double overtime as the Oklahoma City Thunder opened their NBA title defense with a narrow victory over the Houston Rockets.

Last season's MVP poured in 35 points, including two clutch free throws with just 2.3 seconds remaining in the second overtime, giving the champions a winning beginning.

The Rockets' big man top-scored with 39 points and also hit a career-high five three-pointers.

But the Thunder's rookie, who added 28 points, was instrumental alongside match-winner Gilgeous-Alexander.

"Determination and defense," SGA said of their showing. "We know that when we do it defensively we give ourselves a opportunity no matter what's going on—makes, misses, fortune or bad luck. We did enough defensive work to get the win. We're still shaking off rust, but it's a good start."

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

Oklahoma City beat the Indiana Pacers in last season's championship series. It was their maiden championship since the franchise relocated in 2008 to Oklahoma City from Seattle, who had won the 1979 crown.

The Pacers will have the opportunity to get some early revenge on Friday when they face the Thunder, while the Houston are back on court on the same day at the Detroit Pistons.

Elsewhere, a massive performance of 43 points, 12 rebounds and nine dimes from Luka Doncic was insufficient to stop his new team the 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 missing the league's top scorer James as he recovers from a back issue.