Briton Andy Murray, who won the gold in the tennis event of the London 2012 Olympics games last Sunday, withdrew from the Rogers Cup because of a knee injury.

"It was a bit sore yesterday, then I had some treatment after the match. It felt a bit better, and then came in today, I saw the physios, they did some work on it, and it's still a bit sore." said Murray.

He continued "I did a little warm-up on the bike to try it out and it was still sore, so I had to make a decision as to what I was going to do, I don't want to go full out and possibly do any more damage. That was why I decided not to play."

Murray was due to play Canadian Milos Raonic for a place in the quarter-finals.

Murray said "It's unfortunate. I think it would have been a fun match. I hope he has a good tournament. Be great for him to go deep in this the tournament here for the first time."