Dallas Mavericks star Luka Doncic will sit out Sunday night's game against the Oklahoma City Thunder because of a right knee contusion.

It's the second game of a back-to-back for the Mavs.

Doncic has been dealing with the injury since Tuesday's 120-117 loss to the Golden State Warriors.

Doncic, a first-team All-NBA selection the past five seasons, is off to a slow start by his standards after missing the preseason because of a calf contusion. He's averaging 28.2 points, 7.8 rebounds and 7.8 assists while shooting 42.5% from the floor and 32.1% from 3-point range.

He said he felt "a little bit less" than 100 percent after Saturday's 110-93 win over the visiting San Antonio Spurs that snapped the Mavs' four-game losing streak.

"It's a matter of time," Doncic said. "Just there's not a lot of time to rest. But I'll get better for sure. I promise."