Roger Federer has refused to launch an all-out assault on the shaky second serve he believes Andy Murray "covers very well" in tomorrow's Wimbledon semi-final.

Federer was urged to "take advantage" of Murray's second-serve shortcomings by three-time Wimbledon finalist Andy Roddick, to keep his bid for a record eighth SW19 title alive.

Swiss second seed Federer eased past Gilles Simon in straight sets to book his 10th Wimbledon semi-final and a meeting with Murray, who coasted past Vasek Pospisil.

World No.2 Federer insisted Murray's second serve "can't be that bad", ahead of tomorrow's clash, a re-run of Wimbledon's 2012 final.

"We'll see," said Federer, when asked if he would attack Murray's second serve. "He's beaten me before with that second serve; it can't be that bad.

"He's beaten so many guys so many times. You know what I mean? It's something he covers very well: he's fast on his feet, he reads it well.

"He's one of the greatest return players we have in the game, and he's got a great first serve. He came through convincingly again, so he must be playing well.

"Plus he won Queen's; he's in full flight right now."

Federer set a record 116 consecutive service holds en route to his classy victory over 12th seed Simon, eclipsing the 111 mark set by Australia's Wayne Arthurs in 1999.

Meanwhile, Richard Gasquet dumped French Open champion Stan Wawrinka out of Wimbledon in a gruelling five-set quarter-final to book a last-four meeting with Novak Djokovic.

Gasquet forced a thrilling match into five sets, only to slip up when serving for the match - but the undeterred 21st seed recovered his poise to move past his 30-year-old Swiss opponent.

Gasquet booked his first Wimbledon semi-final since 2007 with a 6-4 4-6 3-6 6-4 11-9 win in a vintage battle that gripped the Court One crowd.

France's world No.20 admitted he had to come through several big tests of nerve to book just the third grand slam semi-final of his career.

The 29-year-old from Beziers will now take on top seed Novak Djokovic in tomorrow's last-four match-up, conceding the defending champion will enter their clash as hot favourite.

"I really wanted to win; it's a quarter-final and a big match against Stan," said Gasquet.

"I kept fighting and I'm really pleased to do it.

"I was very aggressive, and of course it's a great battle, and to win, it's wonderful.

"It was tough for me that last set, but it was great to come through.

"I will be happy with how I played today and I will try to do the same again against Novak.

"He will be the favourite of the match, everyone knows that.

"He's the best player in the world, and I will try my best."

Djokovic rubber-stamped his place in the last four by sweeping aside Marin Cilic in straight sets.