Three set points for Williams.

Naomi Cavaday
BBC Radio 5 Live Sports Extra tennis commentator

We haven't seen many winners from the pair of them. It's been a really good level from both of them but there have been a lot of forced errors going on.

A hold to love from Sakkari, but now she has to break the third seed or she will lose the opening set.

Naomi Cavaday
BBC Radio 5 Live Sports Extra tennis commentator

It feels like Sakkari hasn't found a way to hurt Williams yet. Williams is locked in with great consistency. She really is executing in all areas.

We've only seen 32 minutes of action and Serena Williams is now one game from the opening set.

That fifth game when she had to save three break points looks like being a turning point as Williams has put her foot down on the accelerator since. No problems in game seven and a 5-2 lead is hers.

Image source, Getty Images

Williams cranks up the pressure and the power.

Sakkari, on the stretch, can only send a forehand into the net and Serena, who nearly lost her serve in the past game, gets the first break in the next one.

A second break point came for Williams but went with a brilliant serve from Sakkari. But now for the third time Williams has another chance.

For the second Grand Slam in a row, Maria Sakkari is playing in the last 16. She got into the fourth round of a Slam for the first time in her career in the Australian Open earlier this year, but fell to Petra Kvitova, losing 6-7 (4-7) 6-3 6-2.

But Williams can't take it and it's back to deuce.

Break point for Williams as Sakkari, from the baseline, tries a two-handed backhand cross-court winner but has too much power on it and out it goes.

Sakkari missed three break-point chances in the last game and now she's been taken to deuce in the sixth game.

Not for the first time this tournament, a shirtless Dominic Thiem is watching on from his balcony.

Remember, a number of top players are staying in corporate boxes overlooking the court and regularly pop out on to their balconies to watch a bit of action.

As always we want your comments and thoughts on all the action so tweet us using the hashtag #bbctennis.

Maria Sakkari will be thinking that was a game she should've taken but it's slipped through her fingers. It was 0-40, but Williams collects five points on the bounce and we remain on serve. Only just.

Is that going to be a crucial game in this first set?

A solid Williams serve and Sakkari has seen three chances come and three chances evaporate. Deuce. Williams holding on in this game.

Williams saves the first break point as she pulls a forehand too long, but she still has another two chances.

Make than one, as Sakkari nets. 30-40.

Three break points for Sakkari as Williams sends a forehand halfway up the net. 0-40

A first half-chance comes in game five, with Williams at 0-30.

Yet another ace, that's already four in two service games from Maria Sakkari and that helps her to another routine hold. A match of the highest quality so far.

A big day for the British pairing of Jamie Murray and Neal Skupski as they take on Mate Pavic of Croatia and Bruno Soares of Brazil in the quarter-finals of the men's doubles

That one is on Court 17 and set to start shortly.