Oklahoma City's Shai Gilgeous-Alexander collides with Houston's Reed Sheppard during an NBA game on Tuesday in Oklahoma City. Gilgeous-Alexander scored 35 points as the Thunder launched the defense of its NBA crown with a 125-124 double-overtime victory.

Oklahoma City Thunder players pose with their rings in front of the championship banner before tip-off in their season opener against the Houston Rockets at Paycom Center on Tuesday in Oklahoma.

Shai Gilgeous-Alexander scored 35 points as the Oklahoma City Thunder launched the defense of its NBA crown with a thrilling season-opening 125-124 double-overtime victory over the Houston Rockets on Tuesday.

Gilgeous-Alexander, the reigning NBA and NBA Finals Most Valuable Player, drew a crucial foul with 2.3 seconds remaining before nailing two free throws to settle an epic duel with a new-look Rockets side spearheaded by Kevin Durant and Alperen Sengun.

Gilgeous-Alexander's winning free throws settled a triumphant occasion for the Thunder, which had earlier seen its players and staff presented with diamond-encrusted championship rings to mark last season's NBA Finals victory.

However after watching Oklahoma City hoist the franchise's first ever championship banner, the Rockets had threatened to spoil the party for long periods, with Sengun and Durant combining superbly to keep Houston in front for much of the game.

"Grit, determination and defense," Gilgeous-Alexander said when asked to sum up the Thunder's nail-biting win.

"We know that when we do it (on defense) we give ourselves a chance no matter what's going on — makes, misses, good luck or bad luck. We did enough defense tonight to get the win. We're pretty rusty, but it's a good start."

Gilgeous-Alexander was backed by 28 points from Chet Holmgren, while Ajay Mitchell caught the eye with 16 points off the bench that included a trio of three-pointers.

Turkish star Sengun led the Houston scoring with 39 points that included five three-pointers, while Durant, who joined from the Phoenix Suns in the close season, added 23 points.

The Rockets had led by 12 points in the third quarter, but Oklahoma City came roaring back to edge ahead late in the fourth quarter.

Durant put the Rockets back in front 104-102, but Gilgeous-Alexander's pull-up with three seconds remaining knotted the score once more and took it to overtime.

The back and forth nature of the contest — which saw no fewer than 22 lead changes — continued in overtime, before Gilgeous-Alexander cleverly drew what turned out to be the decisive foul from Durant to secure the pair of free throws that settled the game.

Gilgeous-Alexander had earlier been front and center of the festivities as Oklahoma City's players were presented with their 2024-25 championship rings.

"On behalf of the organization, myself and my teammates, we just want to say thank you," Gilgeous-Alexander said in remarks to the home crowd.

"From the moment we stepped here, the love has been unconditional. Whether we were losing by 40 or winning by 40, you guys never wavered, and we will never forget that. This ring is just as much yours as it is ours."

Oklahoma City beat the Indiana Pacers in the Finals last season to win its first title since the franchise moved from Seattle in 2008. The Thunder won it all after a 68-14 regular season that earned it home-court advantage throughout the playoffs.

Commissioner Adam Silver addressed the crowd before awarding rings to Thunder chairman Clay Bennett and team president Sam Presti. After that, the players came through a tunnel one by one, first hugging Silver, then Presti before receiving their rings from Bennett.

League MVP Gilgeous-Alexander was the last to receive his ring. He received "M-V-P" chants as he stood in the tunnel in the moments before he stepped onto the court. After he received his box, he opened it, looked at the ring and shimmied before joining his teammates.

"It was surreal," Gilgeous-Alexander said. "I don't know how to describe it besides that. It was super fun, though. Seeing the banner raised was cool, too, knowing that it'll be up there forever. And we're the first group to bring the city a championship. It's a pretty special feeling."

The rings, designed by jewelery specialist Jostens, are set in 14-karat gold with more than 800 custom-cut, hand-set gemstones.