LeBron James had 37 points, 12 assists and nine rebounds, and Shaquille O'Neal added a season-high 22 points to help the Cavaliers (34-11) win their fourth straight.

Kevin Durant had 34 points, and Russell Westbrook added 23 for Oklahoma City. The the Thunder (24-20) lost to Memphis on Friday night when Rudy Gay hit a 20-foot jumper with 1.3 seconds remaining.

Gibson's 3 gave Cleveland a 98-96 lead. Durant had a chance to tie, but his shot with 0.9 seconds left was blocked by James as Durant fell to the ground. James knocked down a pair of free throws to seal the win, and Durant hit a meaningless 25-footer at the buzzer.

Injuries to Mo Williams and Delonte West forced Gibson into the starting lineup for the first time since Dec. 23, 2007. Gibson didn't record an assist at point guard, but he hit the game's biggest shot.

James grabbed the rebound following a Thunder miss and drove the length of the floor before finding the wide-open Gibson, who hit his third 3-pointer of the night.

Until Gibson's winner, Cleveland relied heavily on James. He played 42 minutes and ran the offense most of the night, scoring 13 points in the fourth quarter.

Gibson finished with 13 points, and Jawad Williams had 12 for Cleveland. Jeff Green added 11 points for the Thunder.