After his withdraw from the final of the ATP World Tour Finals, Roger Federer came across many critics and speculations. He played a three set match against the Swiss Stan Wawrinka, and sports betting has the Davis Cup final this week with the same opponent. He backed out of the ATP World Tour Finals last match against Novak Djokovic due to a back injury that he received on the semifinal just day before the big finale was supposed to be played, Sports Betting and got out in the O2 Arena with apology to all his fans and the crowd that was already there, waiting for the final.