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The Thunder's star player delivered the winning baskets late in a second overtime period as the defending champions started their championship campaign with a 125-124 win over the Houston Rockets.

The reigning MVP scored 35 points, including two clutch free throws with just mere seconds remaining in the second overtime, giving the champions a winning beginning.

Houston's Alperun Sengun led all scorers with a game-high 39 and also connected on a personal-best five shots from beyond the arc.

But Chet Holmgren, who contributed 28 points, played a major role alongside match-winner Gilgeous-Alexander.

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

Prior to the tip-off, the team's title banner was raised at their arena, while the players were presented with their title rings.

The Thunder defeated the Indiana Pacers in last season's championship series. It was their first title since the team moved in 2008 to Oklahoma City from Seattle, who had claimed the 1979 crown.

Indiana will have the chance to secure some payback on Friday when they face the Thunder, while the Rockets are back on court on the same day at the Pistons.

In other action, a huge performance of 43 points, 12 boards and nine assists from Luka Doncic was not enough to stop his current team the Los Angeles Lakers from suffering a 119-109 defeat against the Golden State Warriors.

Jimmy Butler picked up 31 points and Stephen Curry chipped in 23 for the road team.

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