Toronto - Olympic champion Andy Murray was forced to withdraw from the Toronto Masters on Thursday with a knee injury, sending Canadian Milos Raonic into the quarter-finals of his home event.
Murray, who won a struggling second-round match on Wednesday after arriving in Canada on Tuesday from his gold-medal performance at the London Games, was treated for the knee during his victory over Italian Flavio Cipolla.
The pullout came on a day of rain which prevented the start of third-round play with all seven remaining matches finally cancelled in the evening and more bad weather forecast for Friday.
Murray, twice a champion in Canada, will hope to be fit for a title defence starting next week in Cincinnati, the last major tune-up before the August 27 start of the US Open.
"I decided this morning," said Murray. "It was a bit sore yesterday. I came in today, saw the physios, they did some work on it, and it's still a bit sore.
"I did a little warm-up on the bike to try it out and it was still sore. I had to make a decision as to what I was going to do.
"I spoke with the guys and decided the best thing was to rest and try and make sure I can actually let my body kind of adjust to the surface."
Murray said that with his travelling physio on hand, he feels he has a chance to be fit before the Cincinnati start.
"I'll be able to get as much treatment as possible. I wasn't able to do anything to adjust to the surface (from Olympic grass) and get used to the movement at all.
"I'll be able to do that and give it a few days and see how it feels.
"The hard courts, for me anyway, are the hardest on my body. It always takes me a bit of time to get used to playing on them again. I hope it doesn't affect the next few weeks too much.
"Now I have to take a couple days off without playing, so this (injury) may have set me back slightly."
The Murray made 16th seed Raonic the first Canadian into the last eight since Frank Dancevic faced Rafael Nadal five years ago.
Ironically, Raonic had to withdraw injured against Murray in Miami in March.
"It helps me and it doesn't help me," said the Canadian. "But I'm playing pretty well, I'm pretty healthy, so it's a good opportunity.
"I'm just going to try to make the most of it come tomorrow."
Results on the fourth day of the Toronto Masters on Thursday (x denotes seeding).
Milos Raonic (CAN x16) bt Andy Murray (GBR x2) walkover