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Shai Gilgeous-Alexander delivered the game-winning baskets deep into double overtime as the Oklahoma City Thunder opened their championship campaign with a narrow win over the Houston Rockets.

The reigning MVP poured in 35 points, featuring two from the free-throw line with just 2.3 seconds left in double OT, giving the titleholders a winning beginning.

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

But Chet Holmgren, who contributed 28 points of his own, played a major role alongside the game's hero.

"Grit and defense," SGA said of their showing. "We know that when we do it defensively we give ourselves a chance no matter what's going on—makes, misses, good luck or misfortune. We did sufficient defence to get the win. We're pretty rusty, but it's a good start."

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

The Thunder defeated the Indiana 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 claimed the 1979 title.

Indiana will have the chance to get some payback on Friday when they face the Thunder, while the Rockets return to action on the same day at the Pistons.

In other action, a massive effort of 43 points, 12 boards and nine assists from the Slovenian star was insufficient to prevent his new team the Lakers from suffering a 119-109 defeat against the Warriors.

Jimmy Butler scored 31 points and Stephen Curry added 23 points for the road team.

The Lakers were missing the league's top scorer James as he is recovering from a back issue.