Wow. What a return from Katie Boulter, an absolute screamer right out the middle of the racquet on the forehand side that flies beyond Danielle Lao. A break to love for the Brit.

A fist pump from Katie Boulter, and a worthy one too as it meets a fiery backhand winner. The Wimbledon faithful enjoyed that. Massive game from Boulter... and now three break points!

The sun's out, and that exchange at the net was like beach tennis! From break point down, Katie Boulter gets over the line to hold. Potentially a big moment in this match.

Jonathan Jurejko
BBC Sport at Wimbledon

The brollies are back on Centre Court! Nope, not for the rain, for the sun. A couple popped up at the changeover to protect those below them from the summer rays.

That's not to say it will stay this way and leave Andy Murray playing outdoor tennis.

The BBC Weather app reckons there is a decent chance of more rain in SW19 over the next few hours.

Good depth from Boulter and Lao can only slice into the guts of the net. Break point averted, and deuce.

A little loose from Katie Boulter as a forehand drifts wide and that's break point.

Nice touch from Katie Boulter, a little slice that leaves Danielle Lao scuttling towards the ball but thrashing at thin SW19 air. The American is wise to the next one though and comes striding towards the net to pick the Brit off with a volleyed winner. 30-30.

Smart stuff from Lao, working Boulter around with a couple of well-worked points to hold.

Katie Boulter walks on to a short ball but is then sent back-pedalling by Danielle Lao and the American dishes up a huge forehand winner to take the point. Boulter responds with an aggressive return for 30-30.

That's going to hurt.

Katie Boulter of Great Britain battles back from 5-2 down in the first set to force a tie-break against American Danielle Lao.

Lao narrowly takes the tie-break 8-6 though.

All that hustle for no reward.

Image source, Getty Images

Frances Tiafoe is finishing a superb display in style!

The American has three match points on the Tsitispas serve...

This is all getting rather frustrating for Stefanos Tsitsipas.

Another two break points on the Tiafoe serve come and go - his second and third of the set - and he beats the ground with his racquet as the American battles back to take the Greek third seed to deuce.

A thumping serve from Tiafoe completes the fightback, and the American is just one game away now!

Chris Bradnam
BBC Sport commentator at Wimbledon

If Katie Swan can stay fit and healthy, she showed enough having qualified in - there's more to come from the youngster.

Katie Swan goes for the winner but miscues and can Madison Keys get over the line on her third match point?

And Katie Swan saves that too! A little fist bump to boot, and the crowd love it. Deuce.

Oooh. The first goes long off the forehand side for the American. One to go...

So, Madison Keys, to serve for the match...

She kicks off with a monster effort but Katie Swan leaps all over a high-bouncing second serve to make it 15-15. Keys rediscovers her touch though with two snappy serves.

And that means two match points for the American.