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Shai Gilgeous-Alexander scored the decisive baskets late in a second overtime period as the defending champions started their NBA title defense with a narrow win over the visiting Rockets.

The reigning MVP scored 35 points, featuring two clutch free throws with just mere seconds left in double OT, giving the titleholders a positive start.

Houston's Alperun Sengun top-scored with a game-high 39 and also hit a career-high five shots from beyond the arc.

But Chet Holmgren, who added 28 points, played a major role together with match-winner Gilgeous-Alexander.

"Grit and defence," Gilgeous-Alexander said of their performance. "We know that when we execute on defence we give ourselves a opportunity no matter what's going on—makes, misses, good luck or misfortune. We did enough defence to secure the victory. We're still shaking off rust, but it's a positive beginning."

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

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

Indiana will have the opportunity to get some early revenge on Friday when they face the Thunder, while the Houston return to action on the same day at the Pistons.

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

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

Los Angeles were missing the league's top scorer LeBron James as he is recovering from sciatica.