DeMarcus Nelson, one of a handful of guards the Warriors (2-1) are looking at as a possible replacement for the injured and suspended Monta Ellis, added 18 points, seven assists and four rebounds. He had two thunderous dunks, both in the second half.
Kevin Durant had 16 points and 14 rebounds for the Thunder (0-3), who shot just 38.6 percent from the floor to remain winless in the preseason. Damien Wilkins added 23 points, and Chris Wilcox had 15 points and eight rebounds.
Before the game, the Warriors announced they had suspended Ellis for 30 games without pay for violating his lucrative new contract by getting into a mo-ped accident.
Ellis, who agreed to a six-year deal worth $66 million in July, severely sprained his ankle in a low-speed crash in late August. The suspension will cost the guard slightly less than $3 million. The Warriors counted four preseason games in the suspension's length, which means Ellis can't return to the club until after Golden State's 26th regular-season game, against Indiana on Dec. 17.
Warriors coach Don Nelson did not play starting forward Corey Maggette or center Andris Biedrins, but Belinelli made up for their absence with his big night.
Belinelli played sparingly in his first season with Golden State last season but has impressed the coaching staff early in the preseason. The second-year guard had 14 points against New Orleans last Sunday and had nine points and four rebounds three nights later in a win over Portland. Against Oklahoma City, he was 8-of-13 from the floor while logging 45 minutes of playing time.
Golden State first-round draft pick Anthony Randolph added 11 points and Richard Hendrix, the team's second-round selection, added 12 points and 13 rebounds.