Michael Zheng takes a tumble. To deuce we go.

Elsa Jacquemot is fighting back against Naomi Osaka and has secured an early break in the second set.

After missing nine break points in the first set, it will come as welcome relief for the unseeded Jacquemot.

Image source, PA Media

Emily Salley
BBC Sport at Wimbledon

Nerves of steel from Michael Zheng to hold to love.

The same can’t be said of Cameron Norrie and there’s a groan from the crowd as he double faults.

Then there’s a few audible gasps as he angrily smashes his racquet into the pristine green court.

Image source, Getty Images

Double fault number nine from Cameron Norrie. 0-15. Eek.

Michael Zheng executes a pinpoint backhand lob onto the baseline, Norrie flying at full stretch to his right. 0-30. Double eek.

Norrie pegs it back to 30-all, aided by a couple of first serves, but then Zheng turns up the style - cross-court forehand pass on the run. Break point.

Harry Poole
BBC Sport at Wimbledon

Jannik Sinner isn’t one to usually show too much emotion on the court, but he’s been keen to call on the crowd when he feels he has deserved a real fuss from them today - like when he got that fourth-set breakthrough.

Us Brits love an underdog, so it’s no surprise that Miomir Kecmanovic has received the majority of the support so far given his inspired performance.

But is the tide turning now? A stuffed carrot toy was waved by a member of the crowd - that will have to do in the absence of his devoted fan group the Carota Boys - and Sinner responded with a shake of his racquet at the change of ends.

The Italian takes us to a decider and, despite his poor record in five set matches, he looks up for the fight.

This set already looks to have gone from Miomir Kecmanovic but he's unwilling to go down without a fight.

The Serbian battles to deuce.

Ah. It's into the net to hand break point to Jannik Sinner and the Italian takes it.

We're going to a decider.

Image source, Getty Images

No pressure at all for Michael Zheng, rattling through a hold to love. A couple of forehand winners, yet another ace down the T - lovely.

Huge reaction from Cameron Norrie as he secures the hold. Two break points saved.

Michael Zheng is serving to stay in the match.

Image source, Getty Images

Cameron Norrie's serve is firing when he needs it the most! It's slow but the angle does for Michael Zheng, who can't return it into court.

Back to deuce.

Miomir Kecmanovic apologises to Jannik Sinner as his return clips the net cord and drops over to get to 30-30.

Sinner comes up with a big second serve to get back in control of this game and follows with an ace to ensure the momentum stays firmly on his side.

Image source, Getty Images

Tim Henman
Former British number one on BBC One

Jannik Sinner has got away with one there! It was another very poor drop shot.

When you aren't playing your best, you have to go back to basics which is driving big powerful groundstrokes and not playing the touch shots.

It isn't the best tactic but he is up in this fourth set after a heavy strike, which Miomir Kecmanovic couldn't deal with, on the forehand cross-court.

Another opportunity for Michael Zheng.

Emily Salley
BBC Sport at Wimbledon

Cameron Norrie just can't find a way past Michael Zheng at the moment.

Most of the Court Two crowd are behind the British number one, but even they can't help but show some appreciation for some of the shots Zheng is making out here.

They give him a clap for an outrageous winner down the line before resorting back to "let's go Cam, let's go".

Break point saved! Michael Zheng returns a second serve into the net.

Michael Zheng is so elegant coming into the net. A forehand volley levels the game at 15-all.

His second winner of the game is even better - a bending forehand pass with Norrie up at the net. Norrie had played a good backhand volley into the corner but Zheng was quickly onto it. 30-all.

Norrie sends a routine groundstroke long. Uh oh.

Image source, Getty Images

Jannik Sinner screams in delight as he gets the break at the first attempt.

Sinner's heavy forehand into the corner leaves Miomir Kecmanovic stretching and his return goes long.

Miomir Kecmanovic looks to pounce on another poor drop shot from Jannik Sinner but wastes the opportunity and slams into the net to hand the Italian a 30-15 lead against serve.

Sinner gets to the net this time and sends a cross-court winner away for two sights break points.

Good movement into the net from Cameron Norrie, closing off the court and bringing the error from Michael Zheng. 0-30.

Norrie uses his lefty forehand to target Zheng's backhand but the American hangs in and hangs in until Norrie drags on into the tramlines.

Inevitably, Zheng pulls out ace number 20 to level the game before coming out on top of an exhausting exchange with a blistering forehand onto the baseline.

Norrie puts a backhand into the tramlines. Another opportunity snuffed out by Zheng.

Japanese 14th seed Naomi Osaka has taken the first set 6-1 against France's Elsa Jacquemot.

Despite the scoreline, there were chances for Jacquemot with the 23-year-old missing nine break points during the first set.

Osaka is a four-time Grand Slam champion but has never been past the third round at Wimbledon.

Tim Henman
Former British number one on BBC One

That's ace number 23 for Jannik Sinner.

First serve points won haven't been a problem at his end - they are sitting up at nearly 90%...