Boris Becker
Three-time Wimbledon champion on BBC TV

I think the big difference Federer has done is court positioning. He realises that at his age he can't rally with the big players. But by moving into the net he shortens his movement.

The difference between Nishikori during a point and in between points is remarkable. He's dragging his feet around as he makes his way from side to side at the baseline between serves but when the rally kicks in so does the adrenaline. He is the ultimate scamperer but Djokovic's accuracy helps him get on the board in this third set.

Image source, Reuters

A solid start to the third set for Roger Federer. Although Kevin Anderson decides against the mini bagel and lashes down a couple of big groundstrokes of his own.

Federer responds with his eighth ace of the day to hold.

Jonathan Jurejko
BBC Sport at Wimbledon

It wasn’t as straightforward as he would have hoped... but Roger Federer has equalled his record streak of consecutive sets at Wimbledon. That’s 34.

Federer chats to the umpire about something at the back of the court. Not sure what it is - someone in the crowd moving? Unfamiliarity with Court One?

Kevin Anderson has also been complaining so perhaps not.

But the third set gets under way with Federer serving.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

This is big for Djokovic. He's been brittle with the comeback. How badly does he want to pay a Nadal or Federer? Does he believe he can play those two?

And this was the crucial moment in that set.

Nishikori's break at the midway point was the difference...

Things are going Federer's way on Court One but it's not plain sailing for Novak Djokovic on Centre.

Kei Nishikori closes out the second set. We're one set all.

Brilliant weight and depth from Roger Federer, Kevin Anderson can't find his target - the Swiss grinds out a two-set lead.

Roger Federer miscues the first. That's a rare sight. Not that rare, apparently... the second goes long too.

One to go, on the Anderson serve.

Cracking second serve from the South African, Federer can't handle the pace this time. - but then the Swiss picks out a postage stamp forehand to get Anderson scuttling.

Three set points.

Brilliant from Roger Federer, a perfectly weighted backhand winner that draws a fist pump from the eight-time champion.

A huge serve makes it 5-2. Pressure on Anderson...

Image source, Getty Images

Good comeback from Novak Djokovic. He forces Nishikori to serve out the second set of this Wimbledon quarter-final on Centre Court.

Image source, AFP

The slice is right for Roger, he gets the better of a backhand exchange as Anderson coaxes his effort into the net, and the South African then goes long - it's overruled, challenged, eventually Hawk-Eye shows it's long. Now it's Fed up a mini break.

Rory McIlroy and Rod Laver are still chatting away in the Royal Box. Rory looks to be loving it.

Djokovic has been stretching his left leg/hip a couple of times in this set.

He's 0-30 down on his own serve.

Kevin Anderson is going for this. He gets the better of Roger Federer to get the mini-break, before popping a forehand long.

Wham, bam, troubling the best ever in a Grand Slam... a massive serve from Kevin Anderson to get off the mark.

Image source, Getty Images

Jonathan Jurejko
BBC Sport at Wimbledon

This will be the first tie-break which Federer has faced at Wimbledon this year.

Anderson has played four breakers, including winning all three in his four-set victory over Gael Monfils in the last 16.

Big-serving response from Roger Federer. He quickly turns things around to 40-30 and then takes it a to a tie-break.

Image source, PA

The troubled couple, Novak and the umpire Carlos Ramos, have another exchange. Djokovic wants to challenge and after doing so barks "what did you think?" in the Spaniard's direction. "Out," Ramos says. Djokovic doesn't believe him but both umpire and line judge were right. Hawkeye shows the ball landed out.

Nishikori holds.