PHOENIX -- Kevin Durant headed to the locker room just before halftime of Tuesday's 104-93 win in their NBA Cup matchup against the San Antonio Spurs with a left ankle sprain and was later ruled out.

The Suns didn't have an update on Durant's status after the game. Phoenix coach Mike Budenholzer said Durant's ankle stiffened up on him at halftime.

Sprinting the floor in transition, Durant drove to the basket and attempted to cut between Spurs defenders Julian Champagnie and Devin Vassell. Durant stepped on Champagnie's left foot as he rose to take the shot.

Durant fell to the floor, landing flat on his back before immediately grabbing at his left ankle. Teammate Ryan Dunn helped Durant back to his feet, as officials had whistled Champagnie for a foul on the play with 4:30 remaining before intermission.

Durant remained on the floor to connect on both free throws. Durant also knocked down a 14-foot jumper 22 seconds later, before Royce O'Neale replaced him with 3:51 left in the first half. Durant headed to the bench and didn't return for the rest of the first half.

By then, Durant had scored a game-high 13 points on 5-of-8 shooting, including 2-of-2 from deep as the Suns took a 52-39 lead at halftime.

Grayson Allen replaced Durant in the lineup to start the second half. Durant made a brief appearance on the court before walking back to the locker room.

A 14-time NBA All-Star, Durant already had missed seven games due to a right calf injury, with the Suns posting a record of 1-6 during his absence. Durant had played in Phoenix's previous four contests since returning on Nov. 26.

The Suns entered Tuesday with a record of 10-2 in games in which Durant had participated.

Phoenix begins a three-game road trip on Thursday against the Pelicans.