The sixth seeds have the momentum. They continue to roll forward with an opening hold in the third set.

Johanna Konta has a bit of strife at 0-30 down in the first game of the second set.

It feels like the fate of the whole match could be wobbling on a pinhead here.

The British number one locks in though and rescues the game. She is under the pump though.

An error brings up set-point which Nadal converts with a forehand with incredible whip which Tsonga decided running for before he thought better of it.

This is too easy for the Spaniard.

Herbert cannot pick up a dipping Mektic return, sticking it into the gauze, and the Croatians hit back by taking the second set.

This is how the first set went down...

The crowd groan as Tsonga's drop has no legs and drifts into the middle of the net.

0-30.

The two-time semi-finalist turns the game on its head moving the score to 40-30 before Nadal ruins his mood with a forehand that finds the corner.

Speedy recovery from Herbert and Murray to win three successive points before Skugor fizzes a wrist-rattling return on to Herbert's strings for deuce.

The Frenchman then lashes a smash into the net tape.

Uh oh. Set point.

Sloane Stephens hangs in the rallies so well.

Just when it seems that Johanna Konta has her on the run, the American will slice back a backhand down the middle and reset.

Johanna Konta is coughing up a few too many errors and her attempt to tickle into the front court is snared on the top of the net.

First set conceded in her Wimbledon 2019 campaign.

Jonathan Jurejko
BBC Sport at Wimbledon

That quest for perfection will never die inside Andy Murray. The Scot shows frustration - for the first time really today - when a weak return is batted between him and Herbert.

His box have missed those icy glares and inquisitive screams...

Image source, PA Media

Franko Skugor with a miraculous pick-up after Herbert goes straight for him - Kyrgios-Nadal style... somehow the Croatian wins the point. 0-30.

Nadal appears to have speeded up the time he's taking to serve compared to what we saw in his match against Nick Krygios.

He holds with an emphatic forehand smash.

So far so routine for Nadal.

Meanwhile, over in radioland, there has been a surprising revelation from BBC tennis correspondent Russell Fuller - who recalled the time he went for a barbecue at burly actor Brian Blessed's house.

"Years ago when I was a very junior member of the Woking Youth Theatre...his wife was directing a production of Chekov's Three Sisters, and we went over for a barbecue," he tells BBC Radio 5 live.

Russell claims he wasn't one of the sisters. You can listen to live radio coverage here or by clicking on the link at the top of the page.

All of a sudden, Pierre-Hugues Herbert finds himself serving to keep he and partner Andy Murray in this set...

Annabel Croft
Former British number one on BBC One

Stephens has been mentally strong so far in this match, she's had her game face on and she's playing some very smart tennis at the moment.

Johanna Konta biffs a forehand wide. She is not getting the penetration off the ground that she can usually generate.

She has to break in the next game to stay in the first set.

A sliced forehand skids and gives Johanna Konta a world of bother. Sloane Stephens follows up with a vicious forehand angle and has 15-40 and two break points.

Andy Murray is a force to be reckoned with on serve. He dices up another firm hold. Looking solid, the former world number one.

Johanna Konta in trouble here.

A superb drop-lob combo from Sloane Stephens followed by a wretched forehand from the Briton has her looking at 0-30...

Image source, PA Media

Sloane Stephens is rolling like Fred Durst, external in the late 90s at 40-0.

But her comes a speed bump in the form of Johanna Konta' winning forehand rip. Those don't come back.

And then the American duffs long. Just. Perhaps. Stephens was tempted to challenge. It was certainly close.

Instead she just backs herself to get the job done in the next point. And she does as Konta goes long. New balls.

A hold for the Croatians after being taken to deuce, and a quick change of shirt for Franko Skugor - who manages to whip on a new white top while chuntering with the umpire.