Novak Djokovic wins 6-2 4-6 6-1 6-2 v Tim van Rijthoven
Britain's Cameron Norrie into quarter-finals after 6-4 7-5 6-4 win over Tommy Paul
Venus Williams & Jamie Murray lose 6-3 4-6 6-7 (16-18) to O'Mara/Barnett
GB's Heather Watson defeated 6-2 6-4 by Jule Niemeier in last-16 match
GB's Joe Salisbury and Rajeev Ram through to men's doubles quarter-finals
Third seed Ons Jabeur beats Elise Mertens 7-6 (11-9) 6-4
Jannik Sinner defeats Carlos Alcaraz 6-1 6-4 6-7 (8-10) 6-3
Twelfth seed Jelena Ostapenko beaten 7-5 5-7 5-7 by Tatjana Maria
*Watson 1-1 Niemeier
It's 12 years since Heather Watson made her Wimbledon debut, while Jule Niemeier is making her debut at SW19 this year.
Big serves and lovely play at the net from Niemeier sees her power her way to a love hold.
Maria 5-7 7-5 0-0 Ostapenko*
They're going to a third set over on Court One.
Women's 12th seed Jelena Ostapenko had a couple of match points against Germany's Tatjana Maria, but the Latvian was eventually broken instead and Maria took the second set.
Watson 1-0 Niemeier*
Tracy Austin
Two-time Grand Slam champion on BBC TV
Always feels good to get that first game under your belt, get a lead, get some of the butterflies out of the system.
Watson 1-0 Niemeier*
Harry Poole
BBC Sport at Wimbledon
Right then, yes, the tennis. That's why we're really here.
A huge cheer goes up as Heather Watson steps up to serve in the opening game.
A couple of errors give Jule Niemeier hope, but the British number four is up and running in her first major fourth round match!
Watson 1-0 Niemeier*
Heather Watson missed the chance to move to game point without dropping a point, smashing a backhand into the net from close range at 30-0 up.
It's Jule Niemeier's turn to meet the net next though, before Watson fires long off the backhand.
But Niemeier flips a forehand between the tramlines and that's a Watson hold to get us started.
*Watson 0-0 Niemeier
Right, let's get the tennis under way.
Heather Watson to serve first.
As the anthem goes, these are the chaaaaaaaaampions.
Image source, Getty Images
Billie Jean King
Six-time Wimbledon champion on BBC TV
Watson's mum has been such a good stabiliser I think because she doesn't care if she wins or loses.
Watson v Niemeier
Heather Watson's mum Michelle has been loving life in the Wimbledon crowd. Watson jr sang her mum's praises in a BBC TV interview, saying: "Looking over at my team who have been with me for 10 years plus. I'm just so grateful to them for sticking by me when things aren't going well.
"I'm so grateful to my mum for being so level-headed and supportive whether I win or lose. It's so important to have that balance. She's an amazing mum."
Watson and Niemeier are on court warming up.
Image source, Getty Images*Goffin 7-6 (7-3) 0-0 Tiafoe
Are we on our way to losing another men's seed?
There's some distance to go yet, but Belgian world number 58 David Goffin won the first-set tie-break against American 23rd seed Frances Tiafoe.
#bbctennis
Stator: I was a ball boy on centre court at the 2004 Championships. An incredible experience. Just as the players are tense so were we! I remember waiting to go on centre in a side room, Sun peeking in, the crowd rapturous, the fizz of the balls behind the doors
Watson v Niemeier
Anne Keothavong
Former British number one on BBC TV
On Heather Watson's opponent, Germany's Jule Niemeier: She should not be under-estimated.
Niemeier is unseeded but took out second seed Anett Kontaveit in the second round and got a good win over Lesia Tsurenko in the third round - she has got a big serve and a big forehand.
It will be her first time out there on Centre Court, so there are a few unknowns but Heather has played her previously - it was a tight match when she beat her earlier this year - and I am feeling good for Heather.
Image source, PA MediaWatson v Niemeier
Let's turn our attentions to Heather Watson. She's due on Centre Court any moment now for her fourth-round tie with Jule Niemeier.
This is the second meeting between Watson and Niemeier, Watson beating the German in three sets in Monterrey earlier this year.
Speaking of her world number 97 opponent, Watson said: "She's a good player, really, really good player.
"Rankings, honestly, I don't care what anybody's rankings are. Everybody's good.
"When I played her [in Monterrey] she was outside the top 100. I remember saying to my team, 'This girl will be in the top 100 in no time'. It'll be a hard match."
Wimbledon 2022: Watch highlights as Heather Watson's beats Kaja Juvan to make fourth round
Harry Poole
BBC Sport at Wimbledon
Thank you, Sue!
The crowd rise to their feet to pay tribute to Sue Barker. A special moment for her.
Everyone stays upright to cheer the past champions once again as the celebrations are brought to a close.
There’s tennis to come after this as well!
Everyone’s already pumped. Heather Watson is going to have some backing today.
Image source, .*Maria 5-7 3-4 Ostapenko
Away from the Centre Court spectacle, there's been some tennis going on.
Women's 12th seed Jelena Ostapenko has already taken the first set against Germany's Tatjana Maria and it's currently on serve in the second.
Just magnificent to see all those great champions together on Centre Court but sad for her and us that Covid prevented nine-time singles champion Martina Navratilova from joining them...
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#bbctennis
Lynne Wyeth: Olympics 2012 we managed to get tickets (via Australia they were hard to get!) for centre court for the first time, and luckily saw Andy Murray. Had only ever been on outer courts, 1 or the hill previously. Loved it, what an atmosphere.
Image source, Getty ImagesJust the 14 Wimbledon singles titles between these two.
Image source, Getty ImagesOne final word from John McEnroe, to pay tribute to Sue Barker, who is stepping down from covering Wimbledon after this year's tournament.
An absolute legend. She gets a standing ovation and looks a little emotional.
Image source, Getty ImagesCentre Court centenary celebrations
Freya Ridings is the person to take to the grand piano, playing 'Lost Without You'.