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Shai Gilgeous-Alexander scored the winning baskets late in a second overtime period as the Oklahoma City Thunder opened their championship campaign with a narrow 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 remaining in double OT, giving the champions a positive start.

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

But Chet Holmgren, who added 28 points of his own, was instrumental together with match-winner Gilgeous-Alexander.

"Grit and defence," Gilgeous-Alexander commented of their performance. "We know that when we execute on defence we give ourselves a chance no matter what's going on—shots, missed attempts, good luck or misfortune. We did sufficient defence to get the win. We're pretty rusty, but it's a good start."

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

Oklahoma City defeated the Pacers in last season's best-of-seven NBA Finals. It was their maiden championship since the team moved in 2008 to Oklahoma City from Seattle, who had claimed the 1979 title.

Indiana will have the chance to secure some early revenge on Friday when they face the Thunder, while the Houston are back on court on the identical day at the Pistons.

Elsewhere, a massive effort of 43 points, 12 boards and nine assists from the Slovenian star was insufficient to prevent his new team the Los Angeles Lakers from suffering a 119-109 loss against the Warriors.

Miami's star picked up 31 points and Golden State's sharpshooter added 23 points for the visiting Warriors.

Los Angeles were missing the league's top scorer James as he recovers from sciatica.