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Shai Gilgeous-Alexander scored the winning baskets deep into double overtime as the defending champions opened their NBA title defense with a 125-124 win over the visiting Rockets.

The reigning MVP scored a team-high 35 points, including two from the free-throw line with just 2.3 seconds left in the second overtime, giving the champions a positive start.

The Rockets' big man top-scored with a game-high 39 and also hit a personal-best five shots from beyond the arc.

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

"Grit and defence," Gilgeous-Alexander said of their showing. "We know that when we do it on defence we give ourselves a opportunity no matter what's going on—shots, misses, fortune or bad luck. We did sufficient defence to secure the victory. We're still shaking off rust, but it's a positive beginning."

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

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

Indiana will have the opportunity to secure some payback on this Friday when they host the Thunder, while the Rockets are back on court on the same day at the Detroit Pistons.

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

Miami's star picked up 31 points and Golden State's sharpshooter chipped in 23 for the road team.

The Lakers were missing the NBA's all-time leading scorer James as he is recovering from sciatica.