Driving to the basket with 1:12 to play and the game tied at 82, Chauncey Billups felt his left knee "kind of give out on me," sidelining him for the remainder of the game with what the team called a strained knee. "I'm in a lot of pain right now," he said shortly after the Knicks' Game 1 loss to the Celtics, in which he looked out of sorts throughout, shooting 3-of-11 and scoring 10 points.