Jonathan Jurejko
BBC Sport senior tennis reporter at Wimbledon

It might sound a ridiculous thing to say about a five-time Grand Slam champion, but there are still moments when Carlos Alcaraz's concentration goes walkabout.

Luckily the shot-making Spaniard has enough natural talent to make sure he still gets over the line.

We saw that in his opening tussle against Italian veteran Fabio Fognini, where his serve was scratchy and the groundstrokes were uncharacteristically loose.

That allowed 38-year-old Fognini to take him to five sets before Alcaraz pulled through.

Tarvet will be hoping to see the same from the opposite side of the net today.

Nuno Borges gets an early break in the second set.

Borges' shot hits the top of the net and just bounces over which is rather unfortunate for Billy Harris.

Borges apologises as he strides towards his chair at the change of ends.

And then Norrie sneaks to his hold after a backhand cross-court winner and another unreturnable serve.

Good recovery.

British pair Dan Evans and Henry Searle lead 3-2 in the opening set against Harri Heliovaara and Henry Patten.

Searle seals his service game with an unreturnable ace, much to the delight of the crowd on court four.

Ace from Norrie. Lovely stuff.

Another twist! This match continues to deliver as Norrie inexplicably hits a shot long to slip to 30-40.

Reaction from Tiafoe who roars with delight after he holds with a strong serve.

The American needed that.

Jonathan Jurejko
BBC Sport senior tennis reporter at Wimbledon

If Carlos Alcaraz had lost to Italian veteran Fabio Fognini in his opening Wimbledon match, it would have been the shock of the season.

If the two-time defending champion loses to British qualifier Ollie Tarvet in his second-round match, it will be the biggest shock in SW19 history.

Tarvet, a 21-year-old Englishman who plays in the United States college system, is ranked 733rd in the world and playing in his first Grand Slam tournament.

Spain's Alcaraz is only a year older but has already won five major titles and is a superstar of the sport.

Oh, and he's on a 19-match winning streak.

We're just waiting for defending men's champion Carlos Alcaraz to take to Centre Court for his match against British qualifier Ollie Tarvet.

He couldn't, could he?

What a shot from Cam Norrie at 40-30, swiping a passing winner after somehow making an overhead smash.

Deuce.

Image source, Getty Images

Top seed Aryna Sabalenka, speaking after her straight sets win over Marie Bouzkova: "We've played a lot of close matches so I'm pleased to be through this difficult round.

"That was a tough moment of the match [going a break down late in the first set]. I was just trying to put the ball back on that side and hope I could break back. Until that point, my serve wasn't good enough to break.

"But I was able to break and I felt a little bit better at that moment, which is why I think I was able to win the tie-break and win in straight sets.

On seeds falling in first round: "Honestly, it's very sad to see so many top players lose in the first round. But you've got to focus on yourself.

"Of course, you're going to know the overall picture but you have to take it one step at a time. I hope it is no upsets anymore in this tournament, if you know what I mean!"

After a lengthy toilet break from Frances Tiafoe we're back under way on Court One.

Norrie is just eating up the American's second serves now. Swatting another one away to go to 30-30.

Naomi Broady
British player on BBC Radio 5 Live and BBC Sounds

Cameron Norrie's level has been growing. There's been a bit of a pushback from Frances Tiafoe in this third set but Norrie has stayed strong and has continued with the brave tennis that he picked up in the second set.

Harry Poole
BBC Sport at Wimbledon

There was a huge grin on the face of Dan Evans after he volleyed in the opening point of the match.

He’s here to enjoy this.

The 35-year-old celebrated his first Wimbledon win in four years yesterday, as he beat compatriot Jay Clarke to reach the second round.

He’s been offering teenager Henry Searle plenty of pointers so far as they look to stun the champions.

Nuno Borges takes the first set against Brit Billy Harris and pumps his fist in celebration.

Harris makes yet another unforced error and looks downcast but there is still a long way to go in this match and he will serve first in the second set as he looks to get back on track.

Leylah Fernandez, who was 29th seed, has been beaten by Laura Siegemund 6-2 6-3.

The Canadian - and 2021 US Open finalist - has never made it past the second round at SW19.

Jess Anderson
BBC Sport at Wimbledon

Sabalenka wants to get this done.

She's been up out of her seat before the umpire has called "time" at all of the changes of ends in this set.

She's ramped up the aggression and wants this one over with.

The end might be nigh for Marie Bouzkova but she's not just going to hand the match to Aryna Sabalenka.

A tidy volley at the net gives her a hold to love.

The world number one is going to have to serve this one out.

Image source, Getty Images

He gets it! From a set down Cam Norrie is into the lead, holding after Frances Tiafoe fizzes another return long.

The crowd are loving it.