Roger Federer has sounded an ominous warning to his Wimbledon rivals after revealing he is fresh, rested and confident.

The Swiss legend is bang on course for yet another Wimbledon title after he defeated Milos Raonic to set up a semi-final showdown with Tomas Berdych, who benefited from Novak Djokovic retiring hurt.

Andy Murray also struggled with a hip problem as he crashed out, proving that Federer’s decision to rest for six months after a knee problem and also skip the clay court season, was a wise one.

"I'm rested. I'm fresh. I'm confident, too. Then great things do happen. Confidence is a huge thing," Federer said.

"Last year I had a hard, hard time practising through the clay-court season. The grass-court season was difficult because of the back issues I had and the knee issues.

"This year I'm just a normal tennis player again where I can focus on tactics. I think that's the difference. I'm playing very well."

Federer will now play Berdych, and although he is the hot favourite, he is taking nothing for granted.

"Being the favourite or not the favourite doesn't matter, these other guys are all big hitters," Federer said. “They've got big serves, big forehands - big hitters really. All three guys are taller and stronger than I am.

“I've got to figure out a different way, carve my way through the draw somehow with my slice and my spins, my consistency maybe. I'm looking forward to doing that."