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Shai Gilgeous-Alexander scored the game-winning baskets deep into a second overtime period as the Oklahoma City Thunder opened their championship campaign with a 125-124 win over the visiting Rockets.

Last season's MVP scored a team-high 35 points, including two from the free-throw line with just mere seconds left in double OT, securing the titleholders a winning beginning.

The Rockets' big man top-scored with 39 points and also connected on a career-high five three-pointers.

But the Thunder's rookie, who added 28 points, played a major role alongside match-winner Gilgeous-Alexander.

"Determination and defence," SGA said of their showing. "We know that when we execute defensively we give ourselves a chance no matter what's going on—shots, misses, good luck or misfortune. We did enough defensive work to get the win. We're still shaking off rust, but it's a positive beginning."

Before the tip-off, the team's championship banner was unveiled at their home court, while the squad were awarded their championship rings.

Oklahoma City beat the Indiana Pacers in last season's championship series. It was their maiden championship since the team relocated in 2008 to Oklahoma City from Seattle, who had claimed the 1979 crown.

The Pacers will have the opportunity to secure some payback on this Friday when they face Oklahoma, while the Houston are back on court on the same day at the Pistons.

In other action, a massive performance of 43 points, 12 boards and nine assists from the Slovenian star was not enough to prevent his current team the Lakers from falling to a 119-109 defeat against the Warriors.

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

The Lakers were missing the NBA's all-time leading scorer James as he is recovering from sciatica.