Charlotte Coates
BBC Sport at Wimbledon

This is great drama.

Away from the tennis, a lady caught a Jannik Sinner shank and launched it back on to the court from way back. Good arm.

Jannik Sinner stays patient in the rally and eventually profits from a Ben Shelton error to save set point.

Ben Shelton responds with an ace of his own to deny Jannik Sinner.

And the American now has a fourth set point as he sends Sinner the wrong way when he meets the ball at the net.

Lulu Sun uses the whole width of the court, sending Emma Raducanu chasing from one side to the other. She places the backhand past Raducanu after a lengthy rally.

But, the Brit is not out of this game yet as her excellent passing forehand is pushed into the net by Sun and that brings up a break point.

The crowd enjoyed that one.

Image source, Getty Images

Ben Shelton has a gift of a shot to return from the baseline as the ball pops up kindly but a backhand slice is the wrong choice as he goes long.

An ace from Jannik Sinner hands him match point.

Ben Shelton has a third attempt at set point as Jannik Sinner is unable to return his serve.

Charlotte Coates
BBC Sport at Wimbledon

A monster of a forehand from Ben Shelton has the Court One crowd on their feet!

Shelton tries another miracle shot but it’s wide and a huge “ooooh” comes from the crowd.

It's not to be this time.

Ben Shelton's goes after Jannik Sinner with a cross-court forehand but he gets it wrong.

Emma Raducanu has to get down low for the two-hand backhand but it pays off as Lulu Sun is sprinting to meet it but can only find the net. Sun can't return the big serve from the Brit and there's the hold.

A precious hold for Raducanu. From 40-15 up she had to save break points but she's got the hold.

Image source, Getty Images

Jannik Sinner loses his discipline in the rally and sends it wide. We are level again at 5-5.

Ben Shelton's dad and coach, Bryan, calls for calm from the 21-year-old.

Oh my, Shelton fizzes a forehand down the line and has set point.

That's four points in a row for Shelton and he has set point.

A double hold for Ben Shelton gets him back in touching distance but now it's over to Jannik Sinner who could serve out for the tie-break and the match.

The same shot! This time Lulu Sun nails it with pinpoint accuracy to prevent Emma Raducanu from taking the hold. Back to deuce.

A fist pump from Jannik Sinner as his serve is sent back into the net by Ben Shelton.

He has one foot in the quarter-finals.

Image source, Getty Images

Oh my! Lulu Sun advances into the net for the forehand volley and she has the court at her mercy but goes long. That's disappointing for the qualifier.

Break point saved.

We have our first break in this tie-break as Jannik Sinner pops it up on the baseline and Ben Shelton is unable to return cleanly.

Sinner guides a forehand cross-court to get daylight.

Oh wow. What a forehand return from Lulu Sun. Cross-court and kissing the line right into the far corner of the court.

Emma Raducanu is running out of time to find the solutions. Break point.

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

Emma Raducanu has been trying to stay positive.

She never gives too much away, she is quite serene on the court and she takes it all in her stride and soaks up the pressure.

She has to just hang in there and stay in the points. The more she can keep that first serve percentage up, that helps her because she is not on the back foot so quickly in the rally.

It can change everything if you start getting a lot of first serves in.

Image source, Getty Images

A loose backhand from Lulu Sun, we haven't seen many of those so far. She makes up for it on the next point when she forces Emma Raducanu long then sends us to deuce with another brilliant forehand.

She's getting to absolutely everything!

Ben Shelton off to a positive start with a hold of serve.

Jannik Sinner volleys and Shelton scuffs the return long. 1-1.

Fine bit of disguise from Sinner with the overhead volley to lead 2-1.