Katie Boulter tries to find the line with a flinging forehand, but she misses by mere millimetres.

The world number 24 pulls herself level at 30-30, though, with a blistering winner after sending Rebecca Sramkova the wrong way.

Emma Raducanu will have enjoyed that one. The British number two has returned to the GB bench to cheer on her team-mate.

Stunning! Rebecca Sramkova has the whole court to aim for as Katie Boulter comes to the net, but the British number one sticks out her racquet to reach the ball and dink over a delightful little volley.

We're back on serve.

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Katie Boulter does well to get a big serve from Rebecca Sramkova back over the net, and the Slovak goes long with her next point.

Break back point.

Brilliant from Katie Boulter, who catches the line with pinpoint precision to bring us to deuce.

There's no stopping those. Three booming aces in a row from Rebecca Sramkova.

But then comes a double fault, pulling Katie Boulter back to 40-30.

Rebecca Sramkova sends Katie Boulter one way, then the other before advancing to the net to wrap up the point with a forehand that blazes past the British number one.

Advantage Rebecca Sramkova, and another break point for the Slovak as Katie Boulter fizzes a forehand wide.

A great response from Katie Boulter, who goes big with the serve and Rebecca Sramkova can only swing and miss. Deuce.

Oh dear. Katie Boulter goes long to hand Rebecca Sramkova the first break point of the second set.

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Katie Boulter looks like she's on her way to a love hold, too, but the British number one's momentum slows with a double fault and a wild mis-hit. 30-30.

Sue Thearle
Tennis commentator on BBC Red Button

That feels like the reset button has been pretty emphatically pressed.

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A perfect start to this second set from Rebecca Sramkova, who races through to a love hold.

Olga Savchuk
Ukrainian former player on BBC Red Button

The score on the screen looks quite easy but we all know it's not as easy and Katie Boulter had to produce some real quality to win the set.

In the short gap between Emma Raducanu's victory and Katie Boulter's match, the pair were able to exchange a few words.

In Boulter's last win, she said Raducanu had asked her to slow things down so she could return to the bench and watch some of the British number one's match.

If Boulter keeps going at this rate, then there might not be much of a chance for her team-mate to finish her warm-down and media duties.

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Yes she can! Katie Boulter wraps up the first set in style, sending a blistering ace - her first of the match - past Rebecca Sramkova.

Rebecca Sramkova jumps up and down frustration as she slams the ball into the net and hands her opponent another set point.

Can Katie Boulter get this set over and done with now?

And the same thing happens on the second second point as Katie Boulter finds the net again. Deuce.

Katie Boulter fires a backhand into the fence.

Set point number two.

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Olga Savchuk
Ukrainian former player on BBC Red Button

I'm really impressed to see there is absolutely zero hesitation from Boulter's racquet. She's really going for it, knowing the importance of this moment but still trusting her shots. It's always good to see under pressure and that's made an impact on her game so far this year.