As the Davis Cup final week behind us now, Online Betting Roger Federer decided to withdraw from the ATP World Tour Finals last match with just hours before the game. The title game against Novak Djokovic on Sunday was not played, Online Betting as Roger Federer commented that he had back problems. Djokovic without a fight claimed the third title in three years at the year-end event. The 17-time Grand Slam champion decided to back away from the last fight in the ATP World Tour Finals as he said that he hurt his back in the last match against Stan Wawrinkaon Saturday night, where Roger Federer almost got out of the competition, but managed to save four match points.