Katie Boulter had lost a bit of intensity, but she steps it up again and starts hammering the ball over the net.

A bit too much pace on that backhand, though. 30-30.

It feels like Carol Young Suh Lee has really settled into this match now, and she’s not going anywhere. Katie Boulter is going to have to work hard for this one.

Although that was a much more commanding service game for the Briton as she holds to 15.

Katie Boulter can't make the most of the break point and Carol Young Suh Lee reasserts control to grab the hold and move in front for the first time in the match.

Image source, Getty Images

Carol Young Suh Lee is throwing slices at Katie Boulter and it's becoming a bit of a problem for the Briton. She just can't connect with them in the way that she wants to.

But the world number 62 keeps herself in the game and slams away a return to bring up a break point.

Heather Watson
British tennis player on BBC Radio 5 Sports Extra

Even with Katie being a set up, you can still feel the pressure that Lee is constantly applying. She is fighting for every single point and scrapping for every games.

Katie Boulter did well to find the court with a makeshift moonball as she reached for a fiery forehand by Carol Young Suh Lee, but the world number 143 takes control and finishes off the point.

A Boulter forehand sails long, gifting Lee the break.

Katie Boulter turns defence into attack in a 17-shot rally and eventually Carol Young Suh Lee can't cope with the pace.

But the British number one pushes the ball into the net on the next point and we're back at deuce.

Katie Boulter gets herself back in front, but a double fault undoes her hard work and we head to deuce.

Heather Watson
British tennis player on BBC Radio 5 Sports Extra

This match has just been so close. It really could have gone either way in that last set so credit to Katie for getting it over the line in the last game.

Lee made it really tough for her and I think she's going to continue to do so. I think Lee is going to be mentally tough and consistent throughout this entire match.

Katie Boulter gets away with one there. At 0-30 down, the ball clipped off the net cord and took an age to fall, but it does finally bounce off the line and catch out Carol Young Suh Lee.

Hmm, that off-court break doesn't seem to have done the trick for Carol Young Suh Lee as she is broken to love on her return.

Katie Boulter, meanwhile, looks pumped up for this now.

BBC Radio 5 Live

Great Britain's Katie Boulter, speaking to BBC Radio 5 Live earlier this week about marrying fellow professional Alex De Minaur last month: "It was a really special few days. We had a couple of ceremonies - one was in the UK for my nearest and dearest. It was like eight people, very, very small and very much for my Grandpa. It was incredible.

"It was a huge contrast to our Italian wedding which had all of our closest people, our friends, and was a little bit more of a party and a lot of fun. We had three days in Italy in the Tuscan hills."

On De Minuar's speech: "He was amazing. I was a little sceptical at the start because I hadn't seen him do any prep for the speech at all and he was just like 'I'm just going to wing it, it'll be fine, how hard can it be?'.

"And I don't know if he was secretly doing a lot himself or if he winged it but he was amazing, he was so, so good. I was crying the whole time and I think I permanently cried for three hours straight during all the speeches so it was very nice to be with everyone and share that moment."

Carol Young Suh Lee has decided to head off court for a reset.

Katie Boulter decides to make the most of the American's absence and she hammers home a few practice serves.

Finally! Katie Boulter clenches her first and roars towards her team.

That took a while, but she fends off four break points in a mammoth game and finally wraps it up on her fourth set point as Carol Young Suh Lee finds the fence again.

Image source, Getty Images

Katie Boulter flings a forehand wide to hand Carol Young Suh Lee another break point, but the American can't deal with the pace on Boulter's next serve.

And the British number one brings up set point number four with a fierce serve-forehand winner combo.

Carol Young Suh Lee finds the fence, too. Deuce.

Carol Young Suh Lee has somehow managed to hold on, saving three set points, and now she can break as Katie Boulter nets.

A third set point comes and goes for Katie Boulter as Carol Young Suh Lee makes another move to the net and aggressively thumps down a winner.

Heather Watson
British tennis player on BBC Radio 5 Sports Extra

Lee is doing such a great job of putting that pressure on Katie and making her play the extra ball.

Ah. The frustration shows for Katie Boulter as she finds the fence again. Deuce.