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Shai Gilgeous-Alexander scored the decisive baskets deep into a second overtime period as the defending champions started their NBA title defense with a 125-124 victory over the visiting Rockets.

Last season's MVP poured in a team-high 35 points, including two from the free-throw line with just mere seconds left in the second overtime, securing the champions a winning beginning.

Houston's Alperun Sengun led all scorers with 39 points and also connected on a personal-best five three-pointers.

But the Thunder's rookie, who added 28 points of his own, played a major role together with the game's hero.

"Determination and defence," SGA said of their showing. "We know that when we do it on defence we give ourselves a chance no matter what's going on—shots, misses, good luck or misfortune. We did enough defensive work to secure the victory. We're pretty rusty, but it's a positive beginning."

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

Oklahoma City beat the Pacers in the previous season's championship series. It was their first title since the franchise moved in 2008 to Oklahoma City from Seattle, who had won the 1979 title.

Indiana will have the chance to secure some payback on this Friday when they host the Thunder, while the Houston return to action on the identical day at the Pistons.

Elsewhere, a massive effort of 43 points, 12 boards 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 Warriors.

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

The Lakers were without the NBA's all-time leading scorer James as he is recovering from sciatica.