Right, off we go on Court One with Coco Gauff on serve.

Nuno Borges served for the set at 5-4 but as he walks off the court for a break, he's down two sets to love. A loose backhand sealed his fate in the tie-break.

Penny for his thoughts.

The backhand winner is followed by a forehand winner. At the back end of this second set, Jannik Sinner has relocated his radar.

Oh yes! That might be Jannik Sinner's best shot of the day as he finally nails a backhand down the line, the ball landing centimetres from the tramline.

Excellent defence from Jannik Sinner to scramble on his backhand and get the ball back into play. It bounces up high in front of Nuno Borges but he puts his forehand into the net. The value of forcing your opponent to play an extra shot, eh?

James Gregg
BBC Radio 5 Live reporter at Wimbledon

It's Joao Fonseca time on court 3.

The Brazilian sensation always draws a big crowd from back home in South America. Temporarily, this is going to turn to Copacabana for his second-round match.

It's the place to be...

Image source, Getty Images

It's all been very straightforward in the ladies' singles draw. Just two of the top 20 seeds have been handed an early exit - eighth seed Elina Svitolina and 20th seed Maja Chwalinska.

Argentina's Solana Sierra is looking to add another seed to that list but history suggests she has her work cut out to send seventh seed Coco Gauff home early.

The pair have met twice previously - both earlier this year - with Gauff coming out on top on both occasions.

Pat Cash
Former Wimbledon champion on BBC Radio 5 Live

That was a good effort from Nuno Borges after a really poor game while serving for the set.

He has settled down nicely and gone back to exactly what he has been doing. I think he managed to get rid of those nerves, but I'm sure they will come up again here in the tie-break.

But the way he has been striking the ball, generally speaking, means he is in with a real shot.

What a belting return of serve that was from Jannik Sinner. He read Nuno Borges' serve out wide, whipped his backhand around it to open up the court nicely.

Borges wins the next put to put the tie-break on serve.

An early mini-break for Nuno Borges as Jannik Sinner sends a backhand long.

Nuno Borges holds to love. We're going to a tie-break - how unlikely did that seem five minutes ago?

Boom. Jannik Sinner wallops a smash home for 40-0 and holds to love.

Momentum has swung. Nuno Borges will have to serve to stay in the second set.

Image source, Getty Images

Seventh seed Coco Gauff is next up on Court One against Argentina's Solana Sierra.

Gauff has never gone beyond the fourth round at Wimbledon but looked pretty solid, losing just three games, to beat Tamara Korpatsch in straight sets in the first round.

Could this be Gauff's year to enjoy a deep run?

Pat Cash
Former Wimbledon champion on BBC Radio 5 Live

It is incredible. Nuno Borges hasn't missed two shots in a row like that for the whole of this second-round match. He has been hitting the ball really cleanly and getting Jannik Sinner on the run today.

It was a pretty regulation backhand into the net and a forehand that went all over the place before wobbling its way six-feet out. The stress of serving for the set showed.

Another unforced error from Nuno Borges - his fourth or fifth of the game - and Jannik Sinner is back in business in this second set. But my word, how lucky was the Italian?

Huge stroke of luck for Jannik Sinner. He was on the back foot having slipped on the baseline but a net cord sends Nuno Borges scrambling up the court and Sinner executes a lob which Borges can't put back into play.

Image source, Getty Images

Aryna Sabalenka, speaking after her 6-1 7-6 (11-9) win over McCartney Kessler in the second round: "That was a true battle. I'm super happy I was able to stay in that second set, get in the tie-break.

"Was truly great fight and level in that second set from her and she really tested me today. I'm really happy to pass the test. And really unbelievable atmosphere [from the crowd], thank you so much."

On what she was telling herself in the second set: "I was just keeping telling myself to stay low and put the pressure back on her and maybe you will be lucky enough to get this set.

"She played incredible, stayed super aggressive, it felt like whatever decision she made it would work her. Was really tough to handle that set. Once again, I'm glad to power through that set.

Rating today?: "Tough one, to be honest. I would say if we are talking about the fight and having to overcome some test, I would say probably nine out of 10 because that was really tough to overcome in the second set."

Oh no! It was there for Nuno Borges but he plants his backhand in the net.

Slightly nervy from Nuno Borges as he gifts Jannik Sinner a 15-30 lead with a couple of unforced errors but he responds with a well-placed cross-court forehand winner.

Sinner is also feeling generous and drags a forehand long.