The Thunder star came to Oklahoma City in 2019.
The Thunder's star player delivered the game-winning points deep into a second overtime period as the defending champions opened their NBA title defense with a narrow victory over the visiting Rockets.
The reigning MVP scored 35 points, including two clutch free throws with just mere seconds remaining in double OT, securing the champions a positive start.
The Rockets' big man top-scored with a game-high 39 and also connected on a personal-best five three-pointers.
But Chet Holmgren, who contributed 28 points of his own, was instrumental alongside match-winner Gilgeous-Alexander.
"Grit and defence," SGA commented of their showing. "We know that when we do it defensively we give ourselves a opportunity no matter what's going on—shots, misses, fortune or bad luck. We did sufficient defence to secure the victory. We're pretty rusty, but it's a positive beginning."
Before the game, the team's title banner was raised at their arena, while the players were awarded their title rings.
Oklahoma City defeated the Pacers in last season's best-of-seven NBA Finals. It was their maiden championship since the franchise relocated in 2008 to Oklahoma City from Seattle, who had claimed the 1979 crown.
The Pacers will have the chance to secure some early revenge on Friday when they face the Thunder, while the Houston return to action on the identical day at the Pistons.
In other action, a huge effort of 43 points, 12 boards and nine dimes from Luka Doncic was insufficient to prevent his new team the Los Angeles Lakers from suffering a 119-109 defeat against the Golden State Warriors.
Jimmy Butler scored 31 points and Golden State's sharpshooter chipped in 23 points for the visiting Warriors.
Los Angeles were missing the league's top scorer James as he is recovering from a back issue.
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