Venoy Overton's three-game suspension had been lifted. Overton sat out the Pac-10 tournament after he was charged with a gross misdemeanor for furnishing alcohol to a minor.
Overton said it was difficult to watch star guard Isaiah Thomas play 123 of a possible 125 minutes the past three games.
"I'm just happy my teammates came through and we get to play another game," Overton said. "I can't explain how good it feels, just being in this environment again and all the support from the fans. It's just good to get a chance to play again."
11th seeded Washington will play Georgia in their NCAA tournament opener.