Shai Gilgeous-Alexander joined the Thunder in 2019.
The Thunder's star player delivered the winning baskets late in double overtime as the defending champions opened their championship campaign with a narrow win over the visiting Rockets.
Last season's MVP scored 35 points, featuring two from the free-throw line with just mere seconds left in double OT, giving the titleholders a winning beginning.
The Rockets' big man led all scorers with a game-high 39 and also connected on a personal-best five shots from beyond the arc.
But the Thunder's rookie, who contributed 28 points, was instrumental alongside match-winner Gilgeous-Alexander.
"Grit and defence," SGA said of their performance. "We know that when we execute defensively we give ourselves a chance no matter what's going on—makes, missed attempts, good luck or misfortune. We did sufficient defence to secure the victory. We're still shaking off rust, but it's a positive beginning."
Prior to the game, Oklahoma's title banner was raised at their home court, while the players were awarded their title rings.
The Thunder beat 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 won the 1979 crown.
The Pacers will have the chance to secure some payback on this Friday when they host Oklahoma, while the Rockets return to action on the identical day at the Pistons.
Elsewhere, a massive performance of 43 points, 12 boards and nine dimes from Luka Doncic was insufficient to prevent his current team the Los Angeles Lakers from suffering a 119-109 loss against the Golden State Warriors.
Miami's star scored 31 points and Golden State's sharpshooter added 23 points for the road team.
Los Angeles were without the league's top scorer James as he is recovering from a back issue.
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