Anna Kalinskaya holds serve to take a 4-3 lead in the second set, but the 19th seed is being assessed during the change of ends.

Seems to be an issue with her left thigh or hamstring.

John Lloyd
Former GB Davis Cup captain on BBC Two

Roman Safiullin and his team must have come up with this game plan and thought about the different ways that they could hurt Joao Fonseca by using more variety, such as those drop shots.

It is one thing thinking about the plan, but actually executing it the way he is doing is quite incredible.

Ooof, a half-chance for Roman Safiullin to break Joao Fonseca.

On break point, he goes for a passing shot down the line on the run and he finds the net. Certainly not a gimme, though.

Safiullin earns another opportunity but Fonseca produces a powerful forehand strike for a winner to take us back to deuce.

But third time's a charm for Safiullin in this game! Fonseca goes long with a forehand!

Safiullin is playing some outstanding tennis in this one and leads by a set and a break.

That is more like it from the defending champions.

Julian Cash and Lloyd Glasspool have turned things around against French pair Corentin Moutet and Arthur Reymond.

The British duo and third seeds bounced straight back from the disappointment of losing the opening set to break in the very first game of the second.

They continued to put pressure on throughout before serving it out to take this match to a decider.

After five breaks of serve in 10 games during the first set, neither Belinda Bencic nor Anna Kalinskaya have created a break-point chance in set two.

Only one of the first six games in the second set have reached deuce.

Harry Poole
BBC Sport at Wimbledon

"That's the lovely thing about Wimbledon, you can just be walking around and you come across Novak Djokovic!"

A lady behind me can't believe her luck after stumbling upon a 24-time Grand Slam champion warming up on one of the outside courts before his match on Centre.

Djokovic is hitting with Poland's Hubert Hurkacz just over an hour before he returns to the main stage at the All England Club to face Frenchman Arthur Rinderknech.

It's a nice and relaxed atmosphere - but it doesn't take long for the pace and the power to begin creeping into their rallies.

Huge crowds have gathered all around this court to catch a glimpse of seven-time Wimbledon winner Djokovic, with all eyes and phone cameras firmly fixed on the Serb.

Ask Me Anything

Like every major sporting event, a lot of work goes on behind the scenes at Wimbledon to ensure a smooth operation for both players, fans at the courts and audiences at home.

A big part of this is organising the daily match schedule, with nearly 700 matches taking place across the two weeks of the tournament.

Lots of you have questions on how it all works - and the All England Club have given us some answers.

Centre Court (from 13:30 BST)

• Novak Djokovic v Arthur Rinderknech
• Aryna Sabalenka v Jelena Ostapenko
• Felix Auger-Aliassime v Michael Zheng

Court One (from 13:00)

• Naomi Osaka v Daria Kasatkina
• Jannik Sinner v Jenson Brooksby
• Coco Gauff v Claire Liu

Emily Salley
BBC Sport at Wimbledon

Joao Fonseca is clinging on. He keeps gesturing towards his team, looking for answers but they aren't giving him much. They seem worried.

Not too much longer to wait until Wimbledon's two main show courts open for business today.

Fashion icons Novak Djokovic and Naomi Osaka will open up on day five as they bid to reach the fourth round in the men's and women's singles.

Djokovic has been rocking a slightly divisive blazer this week - some of you have love it, one individual messaged in to say he looks like a child playing dress up who's forgotten the trousers...

Osaka paid "love and respect to Japan" with her eye-catching kimono in round one and opted for a lengthy train in round two.

Image source, Getty Images

Image source, Getty Images

We'll be seeing Naomi Osaka, Aryna Sabalenka and Rafael Jodar in third-round action later.

They're among the players who have gone for an early practice session at Wimbledon today.

Image source, PA Media

Image source, PA Media

Image source, PA Media

Joao Fonseca holds eventually but Roman Safiullin is providing stern opposition for the 19-year-old.

John Lloyd
Former GB Davis Cup captain on BBC Two

Fonseca has to believe this can't keep going like this. He has to keep holding his serve and think Safiullin can't keep this level up.

The level Safiullin is playing at is absolutely incredible.

The Brazilian is rattled. He dominated in his first two matches but he is confused in this one at the moment.

Roman Safiullin is giving Joao Fonseca plenty to think about on the Brazilian's serve.

In a lengthy game which is still ongoing, the teenager has to save a break point against the Russian, who is playing at a level well above his current world ranking of 132.

Ask Me Anything

Been watching the doubles and wondering what the players' hand signals mean? Wonder no more.

Doubles players can use a variety of hand signals to communicate with their playing partner during matches.

Before a serve, the net player on the serving side can indicate to the server how they should play the shot by making a signal behind their back obscured from view of the opposition.

While there are no set rules for what signals are used, there are typically three different ways to indicate the suggested direction of shot, and two to indicate what direction the net player will move in once it has been played.

Our Ask Me Anything team can tell you more., external

An eventful first set containing five breaks of serve eventually goes the way of Belinda Bencic.

The Swiss 11th seed sends down an unreturnable serve on set point and is one set away from becoming the first woman through to the fourth round.

There is better news for home fans out on court 18 in the doubles.

Britain's Henry Patten and Finnish partner Harri Heliovaara have taken the opening set against American pair Mac Kiger and Patrik Trhac.

With no breaks of serve, former champions and number one seeds Patten and Heliovaara had to use their experience in the tie-break to take the first set 7-6 (7-5) and keep themselves in the hunt for a second men's doubles title at SW19.

Having fallen 4-1 down with a double break, Anna Kalinskaya got herself back to 4-4 in the first set against Belinda Bencic...

But then the Russian gives up her next service game, ending with a double fault.

Bencic will serve for the first set after the changeover.

Emily Salley
BBC Sport at Wimbledon

Somebody starts up a chant of "FON-SE-CA" as Roman Safiullin walks out to serve for the set, and again when Fonseca brings up his first break point.

The Russian is having none of it. After sending a piercing pass beyond Fonseca, he waves his arms, whipping up some support for himself.

He walks back to his chair with a clenched fist before remembering to apologise to the Brazilian teenager for almost whacking him with that overhead.

Image source, PA Media

Qualifier Roman Safiullin gets the first set won at the fifth time of asking and 24th seed Joao Fonseca loses a set for the first time at Wimbledon this year.