Tie-break? Don't bank on it. Raonic's serve begins to let him down and Federer takes advantage. Federer pass, then Raonic nets. Three break points...

Stephen in Glasgow, via text: I don't want to speak too soon, but I didn't expect Raonic to cause Federer too much trouble. He's always coped with bug servers well. He out plays those who want to exchange winning shots. It's the players who keep getting the ball back and keep making him play another shot that trouble him.

Image source, AP

Hmmm, how many different ways can I write that this is a simple hold? Raonic barely getting the Federer serve back over the net. When he does, he's chasing shadows. The Canadian would give his right sleeve for a breaker here.

Richard from Bath, via text: Understandable that Raonic could feel overawed playing Federer. He could have been watching him play top flight tennis since he was 9 or 10!!

Anne Randle, via text: Following Djokovic match, if Centre Court so dangerously slippy how come Roger & Milos are managing it very well? Looked to me like Djokovic and Dimitrov were treating grass like clay by sliding deliberately with consequent tumbles.

Image source, Getty Images

If Raonic is under pressure and, let's face it, he is, then he is rising to the challenge. Serving better now than at any other time in the match, he gives Federer no sniff as the shadows creep further across the court. Third-set tie-break?

Jimmy Connors
Two-time Wimbledon singles champion on BBC TV

"Roger has to keep his concentration and maintain the pressure."

If Raonic is Mitchell Johnson - head-hunting balls of fire - then Roger Federer is Shane Warne, mystery balls landed on a blade of grass of his choosing. His serve is under no pressure, easing to holds to keep the pressure on his young apprentice.

Raonic has looked into his bag and pulled out the kitchen sink. If he has decided the way to get back into this is to repeatedly blast bumpers past the Federer racquet, he's going the right way about it. Ace, not returned, ace, not returned. Four aces so far in this set, winning 100% of points when he lands the first.

Image source, Reuters

The thing with Roger Federer is that he makes the impossible not only look possible, but positively mundane. Physics says he shouldn't get to this forehand, let alone pat it back into a place that Raonic can't get to. His reaction is wonderful too. "No big deal". Hold to love, Raonic back under the microscope.

Jimmy Connors
Two-time Wimbledon singles champion on BBC TV

"I would like to see Raonic start taking a bigger chance on his opponent's second serves and step early and give it a go."

Is this the killer blow? Raonic double fault, followed by yet another Federer forehand that makes grown men go weak at the knees. 15-30. Killer blow? Pah. Raonic, permanent crease in his brown, pumps down three snorters and is his chair before Federer can move.

Jamie Scott:, external Surprisingly, Federer and Djokovic have only ever met in one Grand Slam final before: Nole's 1st, the 2007 US Open.

Simon Richardson:, external One of these days, Roger Federer is going to sweat and it'll spark a chaos theory reaction that will destroy the world.

John McEnerney:, external Best day so far - cracking first semi-final and Federer doing his thing, but the legends watching, something special Jack, Rod, BOD! Wow!

Image source, AFP

Sometimes a hold can be completed before your humble text commentator has looked up from the keyboard, let alone think what to write. That looks like being the case until Federer temporarily fluffs his lines. Centre murmurs, but is back applauding when Raonic nets. On serve, on we go.

More stars sending their best wishes to Victoria Duval who has been diagnosed with Hodgkins' lymphoma just days after reaching the second round of this year's Wimbledon.

Puerto Rican tennis star Monica Puig:, external I've known Vicky since we were 10 and I know she is a very strong girl and a great fighter and she will get through this! #FightForVicky

12-time Grand Slam champion Billie Jean King:, external Vicky Duval is a fighter and she will approach this new challenge with a plan and a conviction to win. Thoughts go out to her and her family.

World number 30 Madison Keys:, external Prayers are out to Vicky Duval. Hoping she recovers soon.

Image source, Reuters

Raonic may be 23, but he'd struggle to get served for a pint. Fresh-faced, I'm not sure his shaver ever gets much of a workout. With the confused look of a student facing a tough exam, he pads around the far end do the court. Federer, though, offers a few gimmes, backhands into the net. Raonic hold.

Pat Cash
1987 Wimbledon champion on BBC Radio 5 live

"I don't think Raonic can get back into this. He has to stick with him somehow on serve but there is not enough in his game to trouble Federer. He might as well mix something up now and throw the kitchen sink at Federer. He has to change it or he is going to lose anyway so he might as well try something different try to come into the net more."

Image source, EPA

Federer nips off for a comfort break - even maestros have to go to the loo. He's back, waiting in the shadows for the Raonic serve. One more Canadian mistake could be all she wrote.

Best wishes have been coming in across Twitter for the American world number 114 Victoria Duval, who reached the second round of this year's Wimbledon, after she was diagnosed with cancer at the age of 18.

American tennis star Ryan Harrison:, external Thoughts and prayers with Vicky Duval. Can't find a sweeter girl than Vicky. We are all behind you!

Andy Murray's former coach Brad Gilbert:, external Really sad to hear 18 year old Vicky Duval has been diagnosed with Hodgkin's lymphoma, let's hope she makes speedy full recovery.

Jimmy Connors
Two-time Wimbledon singles champion on BBC TV

"Roger has gone about his business and dealt with what was given to him. Roger can win a lot of ways but Raonic has had a great tournament but only has one way to win. He has to serve Roger off the court and he isn't doing that at the moment.

"But the experience he gets today will serve him well down the road."

Image source, Reuters

Is there any way Milos Raonic can get back in to this match? Roger Federer has been imperious so far, completing the second set with an unreturnable. In both sets he has taken the break opportunities that have come his way and, in between, has moved like liquid chocolate. Simply wonderful.