Wimbledon: Roger Federer Nervous Over Injury on Court

Roger Federer admits he faces a nervous wait to discover if he suffered serious injury when he fell heavily in the closing stages of his Wimbledon semi-final defeat to Milos Raonic on Friday.

Seven-time champion Federer turned his left ankle and jarred his left knee in the fourth game of the final set of his 6-3, 6-7 (3/7), 4-6, 7-5, 6-3 loss.

"I just I hope I didn't hurt myself. Is it a three-day thing, is it a 24-hour thing or is it more? I don't know at this point. I hope it's not so bad," said the 34-year-old, who underwent surgery on the same knee earlier this year.

"I walked it off. I was able to finish. But I don't slip a lot. I don't ever fall down. It was a different fall for me than I've ever had.

"With the body that's been playing up this year, I just hope I'm going to be fine. I believe I am, but I'll know more tomorrow when I wake up."

Federer missed the French Open this year because of a back injury.

It was the first Slam he had been forced to sit out since 1999.

Federer refused to blame the fall for his surprise defeat, which ended his hopes of a record eighth Wimbledon title and 18th major.

He had been in control of the tie and seemed destined to reach an 11th final at the All England Club, which would have made him the oldest man to get that far since 39-year-old Ken Rosewall in 1974.

Federer had break points in the fifth and ninth games of the fourth set before slipping from 5-6, 40-0 with back-to-back double faults to hand Raonic a lifeline.

"I just didn't feel the same after the fall," he said.

"Regardless, he played a great breakpoint to get the break. From then on, if I would have been fresh as a daisy or injured, maybe wouldn't matter because he was serving 140mph anyway.

"I had missed my chances by then. It was a very disappointing half an hour there for me, getting broken at 6-5, getting broken again at 2-1 in the fifth, having the slip.

"Something went wrong. I can't believe I served a double-fault twice. Unexplainable for me really, yeah.

"Very sad about that and angry at myself because never should I allow him to get out of that set that easily."

Federer, who is now without a Slam since he captured a seventh Wimbledon in 2012, admitted Raonic deserved to be the first Canadian man to reach a Grand Slam final.

"He earned it at the end. But I helped him so much to get back. I would like to see a tie-breaker because I was the better player for the fourth set," he said.

"Then again, I know he's great in breakers and all that, it was always going to be tough. But I would have liked to see him scramble more than that."