Emily Salley
BBC Sport at Wimbledon

Both players seem to be dealing with some injury concerns.

Wang Xinyu has a couple of bits of white tape holding in place black strapping over he right elbow.

Harriet Dart, meanwhile, has some tape supporting her left knee.

They don't seem to be holding back here, though.

Just what Wang Xinyu needed.

The 22-year-old from China cruises through that service game, winning it to love.

Zverev, serving for the set, is giving Norrie very little to cling onto.

A loose forehand gives Norrie a glimpse of hope at 30-15 but Zverev isn't going to allow that and charges ahead to take the set.

Impressive stuff from the German.

Image source, PA Media

Johanna Konta
Former British number one on BBC TV

Harriet Dart is just doing a really good job in playing with clarity and staying really engaged.

So far, Wang Xinyu hasn't put up many moments of resistance at all but the few moments where it could have turned, Harriet has come up with an answer straight away and that is keeping Wang a little bit flat and perhaps emotionally discouraged.

She is just doing better than her opponent.

Solid start to the second set for Harriet Dart.

She holds to 30 as Wang Xinyu hits a forehand into the net.

Norrie saves the first break point with a big ace but can not prevent the second as the Brit fires his forehand long.

That is such a disappointing game from Norrie considering Zverev's situation.

Oh. A double fault from Norrie brings up two break points for Zverev.

Superb from Harriet Dart. She breaks again to take the first set.

It was good defence from Wang Xinyu on a number of occasions but Dart just kept belting the ball back to her and eventually she couldn't withstand the pressure anymore.

A well-directed and cleanly-struck forehand down the line clinches the set for the British number two.

Charlotte Coates
BBC Sport at Wimbledon

Word is getting around that Roger Federer is close by. At every change of ends, people around me are up on their feet just wanting a glimpse at the 20-time Grand Slam champion.

A sixth ace of the set from Zverev. On his second serve.

And then another. And another huge serve which Norrie can only send long. And another ace.

When you feel your movement is hampered, it's quite a thing to be able to produce four serves like that and take a hold to love.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

Norrie has to act as though Zverev is 100%, and continue to bring the crowd in.

For Zverev it's mind over matter.

A massive roar from Norrie as Zverev sends his forehand wide.

Zverev trudges back to the chair.

Image source, Reuters

Break consolidated and Harriet Dart is a game away from taking the first set.

A hold to love.

Johanna Konta
Former British number one on BBC TV

Harriet Dart has to stay very present and very clear on what she is doing out there because I do think she is playing Wang Xinyu the right way.

Really clear playing from her, she understands that Wang's movement is really letting her down and she is aware of that by playing into the open court.

Shot.

Zverev tries to catch Norrie out with the volley but Norrie is alert to it to send his own backhand volley over the net.

The German reads the serve well to take us to deuce with a forehand winner before Norrie works himself a game point with a huge serve of his own.

After being broken to start the match, Harriet Dart hit straight back - and she does so again!

Some powerful groundstrokes throughout the game put her in a good position, a double fault from Wang Xinyu hands her break point and she takes it with a fine cross-court backhand.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

Zverev is looking at his dad and his brother – he’s not feeling right.

I’m surprised Norrie took that long to hit (a drop shot).

Zverev certainly seems to be limping at the moment.

Image source, Getty Images

Greg Rusedski
Former British number one on BBC Radio 5 Live

Andy [Murray] will be disappointed, Emma [Raducanu] will be disappointed. The scheduling from Emma's point of view was terrible.

To be the last match on, could be finishing 11 or midnight, having to play a fourth-round match on top of that where she has a real shot to go deep and have her best Wimbledon in singles.

It's a shame for both players, more so for Andy because he wanted one more match here and he wanted to give back to that next generation.

Understandably so, Emma not taking any risks and focusing on the singles.

I was quite surprised when I heard the announcement about mixed doubles but that's just the sort of respect she has for Andy and wanting to play with the legend, everything Andy has achieved.

Thank goodness they had that wonderful send-off on centre Court with Jamie [Murray]. What a moment that was, very emotional for an absolute legend of our sport.

Zverev's serve keeps him in the contest and he moves to game point.

But Norrie finally decides to play the drop shot and take advantage of Zverev's hampered movement.

He nails it and celebrates with the crowd to take us back to deuce.

But the German recovers to take an important hold. It's difficult to tell just how comfortable he is at the moment but that definitely wasn't as straightforward as most of his other previous service games.