Los Angeles Lakers star LeBron James took part in full-contact defensive drills for the first time since he was injured in a Christmas Day game, but won't be ready to play on Sunday. "It's the first time he's been out there in that part of practice, in that type of movement," Lakers coach Luke Walton told reporters on Saturday. Walton said James, a four-time NBA Most Valuable Player, had been working with his own doctors as well as team doctors and training staff as he recovers from a groin injury suffered in the Lakers' holiday win over the Golden State Warriors.