From out of nowhere, service games are being tested on Court One.

Matteo Berrettini is taken to deuce but secures the hold with a sensational forehand pass as Alexander Zverev comes to net.

Zverev, the 19th seed, must serve to stay in the match.

Ideal start to this game by Katie Boulter as Elena Rybakina's forehand fails to clear the net. She does it again soon after on Boulter's second serve and the Brit leads 30-0.

An ace and it is 40-0 but a double fault and a powerful forehand winner brings Rybakina back into it.

Anne Keothavong
Former British number one on BBC TV

Rybakina has come out of the blocks firing. The difference between the two players - ball speed off their forehand wings.

Boulter is not being given the time to set up and crack her forehand like she wants to.

Katie Boulter challenges a call at 40-15 but it is in and Elena Rybakina cements the hold.

The 24-year-old is looking every bit the defending champion so far. Superb start.

Katie Boulter comes to the net at 15-0 down and does well to keep the rally alive but a clipped effort down the line bounces off the frame and Elena Rybakina is on course to follow up the break with a hold.

Alexander Zverev goes missing at completely the wrong time, with unforced errors including a volley into the net and a wide forehand gifting Matteo Berrettini three break points at this crucial juncture of the third set.

But then it's the Italian's turn to err as he wastes all three of them.

A brilliant Berrettini backhand down the line earns a fourth break chance but a Zverev forehand stops him in his tracks before the German goes on to hold. What a hold from 0-40.

Had Berrettini converted any of those break points, he'd have been serving for the match.

Sam Smith
Former British number one on BBC TV

These two are not going to be messing about tonight - they are going to be hitting a lot of lines tonight.

Katie Boulter saves the break point, prompting a cheer so loud it almost lifts the Centre Court roof. She then tries to go for the lob on the next point but Elena Rybakina's height helps her out and she is able to volley the return out of reach.

Another break point and this time Rybakina doesn't pass it up to get the early break.

Jonathan Jurejko
BBC Sport at Wimbledon

Loud cheers greet Boulter finishing off a smartly-constructed point with a forehand winner.

More follow when she forces Rybakina into an error.

In-between they are heard again - for the loud pop of a champagne cork.

Centre Court is getting the party started.

Another good forehand winner by Katie Boulter and it is 30-30 but she then sends a shot into the net and Rybakina has break point...

Some early frustration for Katie Boulter on her serve as she puts a couple of shots into the net and trails 30-0 but then has Elena Rybakina scrambling to connect with her serve before hitting the return out of Rybakina's reach to claw a point back.

Jonathan Jurejko
BBC Sport at Wimbledon

If Rybakina is firing, and can sustain it, then it's hard to see her not winning this match.

Already she is causing problems for Boulter with her huge first serve.

Boulter served superbly in the previous round, and hit aggressively from the baseline, but you feel Rybakina will be able to withstand the pressure.

Fascinating to see how this pans out.

A Zverev hold to love. Then a far more eventful game.

The rally of the match is full of forehands, recoveries and is decided by a lovely Berrettini drop shot. Normal service resumed next point with an ace, and another.

But he's still taken to deuce - for the first time since the opening game of the match. He holds with an ace, of course. 13-10 to the Italian now on that score.

Sam Smith
Former British number one on BBC TV

Rybakina has come out right on song - one of the most understated champions we have had.

A swift and comfortable hold by Elena Rybakina, whose serving is on point.

She rattles off a second ace of the match as she quickly gets to 40-0. Rybakina sends a forehand long but another pinpoint first serve seals the game.

Katie Boulter gets exposed covering off one side of the court as Elena Rybakina claims her first point of the game but Boulter follows it up with a winner before Rybakina scoops a shot from the baseline into the net and Boulter holds.

Encouraging start by the British number one.

Elena Rybakina's returns Katie Boulter's serve but the Brit sweeps it out of her opponent's reach and that gets a huge cheer from the crowd. Rybakina then hits a shot long and Boulter leads 30-0.

A good start by the defending champion as she holds, Katie Boulter sending a forehand return wide at 40-15.

A few shouts of "Come on Katie" from the crowd as they encourage the home favourite.

We've still only seen two break points the entire match on Court One.

It's 10 apiece on the aces front.

A bit of nerves early doors as Katie Boulter slices Elena Rybakina's opening serve out of court but then takes the next point. Good to get on the board early on.