This time she gets it! A blistering cross-court winner and it's four games on the bounce for Katie Boulter.

I don't want to jinx things, but surely she can't lose this match now.

"Let's go Katie" shouts a fan. The world number 62 has another break point after her opponent finds the net.

That's good anticipation there from Carol Young Suh Lee as she races to the corner of the court before Katie Boulter pins a forehand there.

But the American wildcard can't finish the job off and we go to a fifth deuce.

Nope. She puts Carol Young Suh Lee on the backfoot with a decent return down the line, but then she slices a backhand into the net. Deuce.

Here we go. Another break point for Katie Boulter. Can she get this one over the line?

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She cant' make that one count either. Another wide forehand from the British number one and we go to deuce.

That's a bad miss from Katie Boulter on the first break point, but she'll get another crack.

Katie Boulter is really going for her shots now. And it's paying off.

After sending one forehand wide, she ramps up the power again and Carol Young Suh Lee can't deal with it. Two break points.

A forehand by Carol Young Suh Lee loops long and Katie Boulter makes sure to slams the door shut with a strong second serve that Lee can only send beyond the baseline.

That 3-0 lead looks very healthy, but it's just the one break of serve that separates the pair as things stand.

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Katie Boulter broke early in the second set, but she allowed Carol Young Suh Lee straight back in. The Briton won't want to make the same mistake again.

Lee has got a half-chance here, though, at 30-30.

Carol Young Suh Lee saves the first break point with a solid serve, but she lets a forehand fly long on the next one.

An early break for Katie Boulter and that should give her a bit of a lift at the start of this deciding set.

Carol Young Suh Lee sends a winner sailing down the line but Katie Boulter replies with an epic cross-court forehand to bring up two break points.

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Huge hitting from Katie Boulter. Carol Young Suh Lee hangs in for a while, but eventually she skews a return wide.

The door opens up for the British number one as Lee goes wide again. 0-30.

More of that, Katie! A superb winner down the line from the Briton gets the third set up and running.

She sends Carol Young Suh Lee the wrong way with another booming forehand on the next point, while the American can't return the following serve.

Aghh. Another double fault. Those keep creeping in for Boulter.

Luckily, it doesn't matter this time as Lee pushes into the net.

Carol Young Suh Lee looks remarkably calm and composed considering this is her first-ever match in the main draw of a Grand Slam.

Katie Boulter has headed off court. This is going to be a tough ask for the British number one now.

She has the crowd against her and Carol Young Suh Lee has all the momentum.

Carol Young Suh Lee misses her first set point, but she brings up another with an ace and Katie Boulter swipes and misses the American's serve down the T.

We're going to a decider, folks.

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Katie Boulter makes the most of a weaker second serve from Carol Young Suh Lee to take control of the point and flick a forehand winner into the corner of the court.

But the ball takes an unfortunate clip off the net cord on the next point and the ball falls outside of the court to give Lee a first set point.

That is not good for Katie Boulter. She'll have wanted to avoid a deciding set at all costs, but Carol Young Suh Lee has the chance to serve out the second set now and level the tie.

Each time Katie Boulter moves ahead in her service game, she either suffers a lapse in concentration or Carol Young Suh Lee comes out fighting to claw her way back.

And that's the last thing the British number one needs. A double fault and it's a break point for the wildcard.