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Shai Gilgeous-Alexander delivered the winning points late in double overtime as the defending champions started their championship campaign with a narrow win over the visiting Rockets.

Last season's MVP scored a team-high 35 points, including two clutch free throws with just mere seconds left in the second overtime, securing the titleholders a winning beginning.

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

But Chet Holmgren, who added 28 points, was instrumental together with match-winner Gilgeous-Alexander.

"Grit and defense," SGA said of their performance. "We know that when we execute on defence we give ourselves a chance no matter what's going on—makes, misses, fortune or misfortune. We did sufficient defence to secure the victory. We're still shaking off rust, but it's a positive beginning."

Before the tip-off, Oklahoma's title banner was unveiled at their home court, while the squad were presented with their title rings.

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

The Pacers will have the chance to secure some payback on Friday when they face Oklahoma, while the Houston return to action on the identical day at the Detroit Pistons.

Elsewhere, a massive effort of 43 points, 12 rebounds and nine assists from Luka Doncic was insufficient to stop his current team the Lakers from falling to a 119-109 loss against the Warriors.

Jimmy Butler picked up 31 points and Stephen Curry chipped in 23 for the visiting Warriors.

Los Angeles were without the league's top scorer James as he recovers from sciatica.