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The Thunder's star player scored the decisive baskets deep into a second overtime period as the Oklahoma City Thunder opened their NBA title defense with a narrow win over the visiting Rockets.

The reigning MVP poured in a team-high 35 points, featuring two clutch free throws with just 2.3 seconds left in double OT, securing the titleholders a positive start.

Houston's Alperun Sengun led all scorers with 39 points and also hit a personal-best five shots from beyond the arc.

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

"Determination and defense," Gilgeous-Alexander commented of their showing. "We know that when we execute defensively we give ourselves a opportunity no matter what's going on—shots, misses, good luck or bad luck. We did enough defensive work to secure the victory. We're still shaking off rust, but it's a positive beginning."

Before the game, the team's title banner was raised at their home court, while the squad were awarded their championship rings.

The Thunder defeated the Pacers in last season's best-of-seven NBA Finals. It was their maiden championship since the franchise relocated in 2008 to Oklahoma City from Seattle, who had won the 1979 title.

Indiana will have the opportunity to secure some payback on this Friday when they face the Thunder, while the Rockets return to action on the same day at the Detroit Pistons.

In other action, a huge performance of 43 points, 12 rebounds and nine dimes from the Slovenian star was not enough to prevent his current team the Los Angeles Lakers from suffering a 119-109 defeat against the Warriors.

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

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