MEMPHIS — Oklahoma City announced Friday that MVP forward Kevin Durant will undergo a third surgery on his right foot and miss the rest of the season — a move that could alter the Warriors' first-round playoff matchup.The Warriors' magic number to wrap up the Western Conference's No. 1 seed is one."I always hate hearing when anybody is injured and out, especially somebody like Kevin, who is just so good for the league, gracious and such an incredible example," Warriors head coach Steve Kerr said.