Jan Choinski is saved by the net cord.

Dom Inglot
Former British tennis player on BBC TV

I don't think Choinski even expected that. Tiafoe put it in such an awkward place, he can change direction so quickly with minimal takeback.

Jan Choinski gives Frances Tiafoe a taste of his own medicine with a wide serve allowing him to lead 30-15. But Tiafoe takes advantage of a kind bounce and wraps his wrist over the top to smash away a winner.

Stunning tennis from Tiafoe to earn break point. The American comes to meet a drop shot and wallops a cross-court winner into the corner.

Image source, PA Media

On court four, all-British duo Katie Boulter and Heather Watson have forced a decider against Katarzyna Piter and Anna Siskova.

They came through a second-set tie-break 12-10.

It's not been a good day for the Brits in the women's doubles, with four British pairs and 12th seed Olivia Nicholls (partnering Slovakia's Tereza Mihalikova) all falling at the first hurdle.

Can Boulter/Watson give home fans something to cheer?

Marion Bartoli
Former Wimbledon champion on BBC Radio 5 Sports Extra 2

Elena Rybakina will be completely happy with that performance. It was a very clean showing from her.

Honestly, she didn't do much wrong at all today. There were a few forehands that she hit into the net when the ball was low, but she was absolutely brilliant from start to finish. She managed all of the basics on grass to perfection.

It was all about her today.

Frances Tiafoe does not seem to be feeling any added pressure.

A hold to 15 keeps this set on serve.

Dom Inglot
Former British tennis player on BBC TV

The pressure has been built on Tiafoe because Choinski is doing so well on the serve.

Jan Choinski moves on quickly after passing up his latest break point opportunity.

The Briton wins four points in a row to get a hold to 15.

Frances Tiafoe will serve to stay in the set.

Grigor Dimitrov said he still feels nervous when stepping out at Wimbledon after his first round win, but you wouldn't have thought that was the case tonight.

The Bulgarian keeps things on serve by racing to a service hold to love. A few errors are creeping in for Jakub Mensik, he will want to eradicate those sharpish.

Which way is this third set going to swing?

Caty McNally looks anguished as she sends a backhand long.

Oh, Elena Rybakina. She overthought that volley and ended up putting it in the net.

The Centre Court crowd throw their voices behind Caty McNally as she nails a forehand pass for 0-15.

There are groans of disappointment as she returns a deep forehand into the net.

Ace. Applause.

McNally drags the game back to 30-all. "Come on!" comes a shout from the crowd.

McNally advances on the net but can't return a brutal forehand. Match point.

Image source, Getty Images

Frances Tiafoe gets to advantage and hits a 130mph ace.

That'll do nicely.

Dom Inglot
Former British tennis player on BBC TV

Tiafoe is just stepping up his game when it's needed.

Frances Tiafoe has been so strong at defending break points today and he continues that trend by saving for an 11th time.

Remarkable stuff under pressure from the American.

Image source, Getty Images

Jan Choinski has his chance.

Dom Inglot
Former British tennis player on BBC TV

You just get the sense that when Choinski is hitting, he's putting so much effort into every shot. He's so much tenser as well, so when the ball takes a slightly different deviation, he can't adapt quickly enough.

Jan Choinski appears to be getting the better in a rally after sending Frances Tiafoe into the corner with a two-handed backhand, but Tiafoe adds a huge amount spin on his return and the Briton scuffs away to hand back advantage.

But it's a great recovery and fantastic court positioning from Choinski as he gets to the net and volleys a winner.

This game feels like it could be so key in deciding the set.

Elena Rybakina converts her second break point.

A deep return onto Caty McNally's backhand leaves the American off-balance and out of position and Rybakina guides home a powerful backhand winner.