Beijing, July 27 (Reuters) according to the ATP Chinese news website, the 17th session of grand slam champion Roger federer announced on the individual social networking sites, not because of a knee injury, he would pull out all the rest of the year. "Team of doctors and discuss with me after all the possibilities, I made a tough decision. Because of my knee need more time to recover, I will be out of the 2016 season, all the rest of the game. My doctor told me that if I have...