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Shai Gilgeous-Alexander scored the decisive points late in a second overtime period as the Oklahoma City Thunder started their NBA title defense with a narrow win over the Houston Rockets.

The reigning MVP poured in 35 points, featuring two clutch free throws with just 2.3 seconds remaining in double OT, giving the champions a winning beginning.

The Rockets' big man top-scored with 39 points and also connected on a career-high five shots from beyond the arc.

But the Thunder's rookie, who added 28 points of his own, was instrumental alongside the game's hero.

"Grit and defence," SGA said of their showing. "We know that when we execute on defence we give ourselves a opportunity 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 good start."

Prior to the tip-off, the team's championship banner was unveiled at their home court, while the squad were presented with their title rings.

The Thunder beat the Indiana Pacers in the previous season's championship series. It was their first title since the team relocated in 2008 to OKC from Seattle, who had claimed the 1979 title.

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

In other action, a huge performance of 43 points, 12 rebounds and nine assists from the Slovenian star was insufficient to prevent his new team the Los Angeles Lakers from suffering a 119-109 loss against the Warriors.

Miami's star scored 31 points and Stephen Curry added 23 points for the road team.

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