SAN ANTONIO -- San Antonio Spurs All-Star Tim Duncan sprained his left knee and right ankle after getting tangled with an opponent and had to be helped off the court in the first half of Saturday night's game against the Wizards.

Duncan underwent an MRI on his knee Sunday. It showed no structural damage, and he is listed as day to day.

Duncan lay on the court clutching his knee for a few minutes after Washington forward Martell Webster rolled into the back of it while fighting for a rebound. Duncan got up on his own, but limped to the locker room with the assistance of teammates Stephen Jackson and DeJuan Blair.

The 14-time All-Star is averaging 17.5 points and 9.8 rebounds per game this season.

Information from The Associated Press was used in this report.