Tennis: Andy Murray training at full capacity before US Open

British number one tennis player Andy Murray says he can train at "100%" again after the back operation he had last year. The 27-year-old Wimbledon winner had surgery in September 2013 and was out for three months before returning to action in December. "I wasn't able to train as much at the beginning part of the year because of my back," said Murray. "Now I can start training again 100%, not holding back." Murray will be playing at the Rogers Cup tournament in Toronto this week, his first appearance since being defeated in the Wimbledon quarter-finals in July. The Briton will enter the tournament in the second round. He dropped to ninth in the world ranking, so he'll need every point he can get before the US Open which starts on 25 August. "I felt maybe what I was missing was just some physical strength," said Murray. "When you come back on the tour it is a bit of a recovery process. Over the French Open and Wimbledon my back felt very good. Physically, it was fine." Meanwhile Murray seems to have found a new coach after parting company with Ivan Lendl, he said he wanted former Wimbledon champion Amelie Mauresmo to remain his coach for the "foreseeable future". Andy Murray is 7/2 at Bet365 to win the US Open this year.