At 37, Federer is the oldest quarter-finalist since Jimmy Connors in 1991 but he's still light years ahead of those hoping to take his crown.

Will he reach more Slam quarter-finals if he continues to play until he's 40? You wouldn't bet against it.

Back to the action. It's 30-30 before Nishikori goes 'soft-hands' and plays a delicate angled volley.

The Japanese player, who got to the last eight last year, goes on to hold.

29 forehand winners for Roberto Bautista Agut so far in this match.

It's been a weapon and a half for the Spaniard.

He includes two of those on his way to an important hold that stretches his advantage to 4-1 in the fourth set.

Bautista Agut is refocused - and he's closing in on the semi-finals.

Image source, Getty Images

Serena Williams jabs a volley out of the reach of Bruno Soares before Andy Murray comes storming forward and half dives, half stumbles into a volleyed winner down the line.

Murrena get the hold! Is the comeback on?!

The tension keeps cranking up on court two. Murray and Williams find themselves both at the net but Melichar picks an unguarded spot to deliver a forehand winner.

And then a double fault from the former British number one.

Deuce...

Bruno Soares is just showing off now, whipping out a nonchalant walking forehand from his arsenal and cupping it beyond both Murray and Williams.

Serena goes on the attack, and unleashes some frustration with a ferocious winner, before a Murray volley leaves Melichar on the turf.

30-15.

The third is also saved as Nishikori's return flops into the netting.

The Japanese player then goes long before Federer serves an ace to hold.

That wasn't entirely convincing though was it Roger?

The door opens for Roberto Bautista Agut, but he's unable to stroll through at the first glimpse of a breakthrough as Guido Pella fights back to deuce.

The Spaniard earns a second stab at it though with a well-executed forehand, and this time he takes his chance to regain control of the match from Pella.

Bautista Agut is firmly in the driving seat.

Image source, Reuters

Shouts of support echo around court two. This crowd really want to see the Murrena dream live on... But Melichar and Soares are a tad good, moving in unison like synchronized swimmers. They've got every blade of grass covered. Another hold.

Two saved by Federer.

The last time this pair met - at the ATP Finals - Nishikori beat Federer.

A superb forehand winner is followed by a Federer error as he goes long.

What.

Is.

Happening?

Three break points.

Image source, Reuters

"Got it.." shouts Serena Williams as she scuttles across the baseline to retrieve a backhand, but Bruno Soares is just everywhere. The court two villain cracks down a winning volley, and another... 30-0.

Chanda Rubin
American former world number six at Wimbledon

This set has been the only one-sided bit of tennis that we have seen.

Murray and Williams were so close and suddenly Soares and Melichar have opened this match back up and you can feel the lull in energy from the crowd.

Katie Falkingham
BBC Sport at Wimbledon

This Federer-loving crowd are puzzled as to what to do. Do they applaud Nishikori each time he nabs a point? Or do they gasp each time Federer makes an error?

They can’t make their mind up. It’s simply a confused, yet polite, ripple of applause.

Kei Nishikori apologises after a slight mishit deceives Federer. No need Kei.

40-0.

The eight-time champ then produces two marvellous winners to the crowd's delight - many have RF etched onto their brains.

40-30.

Federer then makes another error.

Image source, Getty Images

Julie Lobalzo Wright: So I have no idea who the head umpire is in the #MurRena, external match, but he is definitely my favourite. Smooth, Barry White tones in a glorious accent as he announces each point.

Philip Murphy: I know Tennis purists are moaning, fact is that Andy Murray and Serena William's draw in the mass audience to tennis.

Soares' fizzing volley is too hot for Murray to handle.

The top seeds go a double break up in the final set. Murrena need something, and quick...

Guido Pella has located a weak spot in Roberto Bautista Agut's game and is charging in from the baseline much more frequently than he dared at the beginning of the match.

With a delicate touch, Pella drops a forehand volley beyond the reach of Bautista Agut as he too holds serve - the Spaniard unable to depart the comfort of his baseline quick enough.

With the initiative seized, Pella wears down the Spaniard's serve to earn two break points - but, sensing a pivotal moment, Bautista Agut saves an awkward situation with two trusty forehand winners.

It remains on serve in the fourth set.

Inches long from Serena. Murrena need a moment just to settle here...

Williams hoists one high, Andy Murray scuttles across to take a forehand off her at the baseline but jabs it into the gauze.

Williams then miscues and that's another two break points.

Chanda Rubin
American former world number six at Wimbledon

It's impressive the way Melichar and Soares have regrouped and stayed together with positive energy.

There are so many ups and downs in a match and it critical that you keep supporting each other.