Michael Zheng speeds through his service game for an easy hold to love.

Cameron Norrie struggling for consistency so far in this second set.

We've not seen Jannik Sinner fully commit to his serves throughout the early stages of this match but there have been glimpses.

A 113mph second serve skips up off the grass and away for ace for 40-0.

Sinner attempts a backhand winner into the corner at 40-15 but gets it all wrong and offers Miomir Kecmanovic a foothold in the game.

Ah, a double fault brings Kecmanovic to deuce.

Emily Salley
BBC Sport at Wimbledon

That won't help Jelena Ostapenko's mood. Her double fault is met with a huge cheer as it hands Harriet Dart the first break of serve in the second set.

The Latvian is giving an angry stare towards her team every time she looses a point.

Harriet Dart is really warming to the task here on Court One.

There are some big cheers as the Brit brings up break point on Jelena Ostapenko's serve.

She can't take it as Ostapenko hits a ball into the corner and shouts and first pumps in celebration.

What's this though? Another chance for Dart... and it's a double fault from the Latvian!

That will put a pep in Dart's step as there are no signs right now of the earlier injury.

Image source, Getty Images

Miomir Kecmanovic looks on track for another routine hold at 30-0 and 40-15 but Jannik Sinner sneaks through a winner to apply a little pressure at 40-30.

No signs of cracking from Kecmanovic, though, as he stands his ground and gets the hold.

Cameron Norrie crashes a forehand winner before crying out in celebration. We've not seen emotion like that from Norrie yet in this match.

The pair trade some delicate winners at the net, before Norrie holds with a big first serve which Zheng can't return.

Image source, Getty Images

New for this year is an inclusive feed on BBC iPlayer of all singles matches on Centre Court, which provides an enhanced experience for blind and low vision fans.

It’s been co-designed by members of the blind and partially sighted community .

Watch the inclusive feed of Jannik Sinner v Miomir Kecmanovic.

French Open finalist Maja Chwalinska exits Wimbledon in the first round after losing to Mananchaya Sawangkaew 2-1.

Chwalinska, the 20th seed, took the first set 6-2 but lost to second 7-5 before being broken three times in the third.

The 24-year-old, playing in the main draw of a Grand Slam for just the fourth time, rocketed up the rankings after becoming the first qualifier to reach the final at Roland Garros.

Image source, Getty Images

As Harry says, we're yet to see the best of Jannik Sinner but it's still early stages and it's going to be a long two weeks so it's all about pacing himself and building into the tournament.

Nonetheless, Sinner gets another hold to 15 to keep this game on serve.

Cameron Norrie whips two forehand winners to earn break point, before clenching his first in celebration.

Michael Zheng battles back to win a lengthy rally and force deuce, before securing the hold as the Briton goes long with a lob.

Both players are struggling a bit for momentum at the moment.

Harry Poole
BBC Sport at Wimbledon

It certainly hasn't been the smoothest start for Jannik Sinner.

The crowd have been engrossed in this from the start, thanks to a few errors by the world number one - renowned for his devastating precision - and a positive approach from Miomir Kecmanovic.

Sinner (seven) made significantly more unforced errors than his opponent (two) in the opening six games, and had to resist those two early break points.

The pressure of performing in front of Becks?

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0-40 was not how Harriet Dart would have wanted to start this second set.

But once again, the British number five shows all her fighting qualities as she gets herself back to deuce.

Jelena Ostapenko might feel it is a missed opportunity early in this second set as Dart comes through to hold and edge in front.

Miomir Kecmanovic is matching Jannik Sinner stride-for-stride at the moment.

Following Sinner's hold to love, Kecmanovic does exactly the same. The Serbian plays a fine drop shot to get the hold.

Centre Court has a habit of drawing celebrity spectators and that's no different today.

Sir David Beckham, who has been spotted across the Atlantic watching World Cup games, is among those in attendance.

Image source, Getty Images

A loose first game from Cameron Norrie after taking that first set as Michael Zheng brings up three break points.

Norrie saves the first two but plods a backhand into the net on the third to gift Zheng the break.

A deflated groan drifts around court two.

Jannik Sinner executes his first drop shot of the match and it's beautifully done to get to 30-0.

The Italian serves deep into the corner and Miomir Kecmanovic's attempted return loops away to hand over the game to love.

Image source, PA Media

Emily Salley
BBC Sport at Wimbledon

Harriet Dart can't believe that. Neither can the crowd. There's a collective 'oooh' on Court One as the replay shows the ball landing right on the corner, only a hairs breadth away from being called out.

That's the first set done and dusted for Jelena Ostapenko.

Martina Navratilova
Nine-time Wimbledon singles champion on BBC Two

Harriet Dart made Jelena Ostapenko earn that first set in the end.

She just needs to do a better job of getting more of her first serves in. She is at 60% right now for first serves in, she needs to better that as she is struggling on her second serve points.

But she is definitely fighting and making Ostapenko hit some more balls. She has to make her feel uncomfortable.

Image source, Getty Images

After losing the opening set against Roman Safiullin 6-4, 12th seed Andrey Rublev has recovered to lead by two sets to one.

Rublev broke Safiullin's serve in the second game of the third set and saved five break points on his own serve to clinch the set 6-3.

However, this match looks set to go the distance, with Safiullin leading 3-1 in the fourth set after an early break of serve.

Image source, Getty Images