Goodness me!

All of a sudden Emma Raducanu has set point. She's struggled a little throughout this set but Lulu Sun sends the volley long.

Image source, Reuters

Emma Raducanu twisting her upper body and placing a hand on her lower back as she walks back to her position on the baseline.

Lulu Sun opens with a brilliant cross-court forehand before Raducanu levels at 15-15 when Sun slams into the net.

The Brit gets a little bit lucky to sneak out to 15-30 when Sun looks to place her forehand down the line but she won't care!

Lulu Sun berates herself for a loose backhand before Emma Raducanu takes the hold when the qualifier nudges into the net.

Sun will serve to take us to a tie-break.

Image source, Getty Images

Well it was a good start. But now Lulu Sun is back level at 30-30.

A huge moment here for Raducanu.

Ashleigh Barty
Three-time Grand Slam champion on BBC TV

It's Sun's confidence to trust her weapons and trust herself.

If she is going to miss, she's going to miss in the right way - but she hasn't missed much today.

A better start to the service game from Emma Raducanu.

She takes advantage of a floaty forehand and crunches into the corner for 30-0.

Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds

Lulu Sun's shots are coming at Emma Raducanu with so much venom, they are just out of her reach.

She is using that leftie serve very, very effectively today.

Too good from Lulu Sun. A brilliant passing forehand then she brings up game point with an ace.

She takes the hold to 15 with another big forehand.

Over to you Emma Raducanu.

Image source, Getty Images

Emma Raducanu does look to be clutching at her back between points. Is something troubling her?

Lulu Sun is serving to stay in the set.

The last scheduled match on Court One is under way with Bulgaria's 10th seed Grigor Dimitrov up against fifth seed Daniil Medvedev.

Dimitrov held serve to start the match.

Go to the 'Watch & listen' tab near the top of this page to watch what should be a cracking match.

A big serve from Emma Raducanu skews off the racquet of Lulu Sun for 15-15.

The New Zealander misses the forehand at 30-15. We've seen her nail so many of those in this match. Raducanu gets away with one.

She hammers down the ace to wrap up the hold.

That's the most straightforward hold she's managed in this set and it keeps that scoreboard pressure up.

Image source, Getty Images

Jonathan Jurejko
BBC Sport at Wimbledon

"Nice. Nice!"

That's the shout about a second after Raducanu pings back a deep return on Sun's second serve at 15-30.

Then, a blink of an eye later, she mishits a return way long.

Raducanu laughs incredulously. Best way to get a shot like that out of the system.

Ashleigh Barty
Three-time Grand Slam champion on BBC TV

Sun’s ability to find that forehand from her first serve has been so good today.

Any chance Emma Raducanu had there was quickly snuffed out with that crunching forehand down the line from Lulu Sun.

She takes the hold. So impressive.

Oh, hello. Emma Raducanu shows some shot variation with a drop shot for 15-30 on the Lulu Sun serve.

Sun slams into the net. Deuce. But she generates some huge pace on the forehand to bring up game point.

Jonathan Jurejko
BBC Sport at Wimbledon

The belief is back. A bit.

Raducanu's ball-striking has more confidence in it, as has the chatter of the crowd at the changeover.

Emma Raducanu goes for power to the corner on the forehand and fends off break point. She takes the hold when Lulu Sun hits the net with her backhand.

Another very difficult hold but she gets over the line in the end.

Image source, EPA