Los Angeles (AFP) - Kevin Durant's dominant 39-point display lifted the Golden State Warriors to a 122-96 victory over the Oklahoma City Thunder on Thursday in the first clash between Durant and his former team.

Amid breathless speculation as to just what the meeting between Durant and former team-mate Russell Westbrook would look like, the Warriors ended the suspense by halftime.

Durant scored 29 points in the first half as the Warriors erased an early deficit to take a 68-43 halftime lead.

He matched his career high with seven three-pointers, pulled down seven rebounds and blocked a shot as the Warriors handed Westbrook and the Thunder their first defeat of the young season after four straight victories.

"KD is KD. He's gonna do what he do," said the Warriors' Draymond Green, who unabashedly acknowledged that Golden State was keen to get their new addition a win over his old team.

The result left the defending champion Cleveland Cavaliers as the only undefeated team in the National Basketball Association, after a 128-122 victory over the Boston Celtics that pushed the Cavs to 5-0.

LeBron James scored 20 of his season-high 30 points in the third period and added 12 assists for the Cavaliers, who are 5-0 for the first time since the 1976-77 season when they started 8-0.

James' 30 points left him tantalisingly close to another career milestone.

With two more points he'll move past Hakeem Olajuwon (26,946) into 10th place on the NBA's all-time scoring list.

Kevin Love scored a season-high 26 points and Kyrie Irving added 23 for Cleveland, who let a double-digit lead evaporate before closing out the contest.

"We want to continue to get better," James said. "When we get up on teams we've got to figure out how to continue to just push the lead up or just keep it where it is and not allow teams to get back into the game."