Radek Stepanek (Cze)/ Nenad Zimonjic (Ser) bts Bob Bryan (US)/ Mike Bryan (US) 5-7 7-6 (12-10) 4-6 6-3 3-6
Serena Williams (US)/ Venus Williams (US) bts Andrea Hlavackova (Cze)/ Lucie Hradecka (Cze) 6-4 6-3
Serena Williams beats Pavlyuchenkova 6-4 6-4
Cibulkova beaten 6-2 6-2 by Vesnina
Venus Williams into last four, aged 36
Kerber into semis after beating Halep
John McEnroe
Three-time Wimbledon singles champion on BBC TV
I often call Serena's serve the most powerful weapon in sport. It's closely followed by her will - her opponents can sense that when the going gets tough. When others get uptight, she becomes more relaxed.
Image source, Reuters*S Williams 6-4 0-1 Pavlyuchenkova
Anastasia Pavlyuchenkova clings onto her serve by her fingernails in the opening game of the second set.
She is feeling the full force of Serena's game now though, living point to point like a shipwreck survivior grabbing desperately to pieces of driftwood.
Cibulkova 1-4 Vesnina*
Annabel Croft
Former British number one
Cibulkova brings so much personality on to the court. Even when things aren't going well you know she will fight to the bitter end.
Image source, Getty ImagesCibulkova 1-4 Vesnina*
Dominika Cibulkova can't get a sniff here.
Elena Vesnina holds to love and then earns three break points.
She loses two of them, but then Cibulkova smashes into the net. A hefty lead for the Russian now.
Image source, APS Williams 6-4 Pavlyuchenkova
This is the shock-and-awe tennis that no other woman in the world can deal with.
Crunching power off that jackhammer serve and bruising groundstrokes hammer a hole in Anastasia Pavlyuchenkova's defences and whisk the first set off its feet.
Image source, Reuters*S Williams 5-4 Pavlyuchenkova
Not a single break point in the first eight games.
But suddenly - via a commanding whip across court from Serena and a netted Pavlyuchenkova forehand - there are three.
Love-40 and Pavlyuchenkova misses with her first serve.
You know what comes next. A dolly second serve, a pulverised backhand return and a despairing look from the Russian as the ball speeds away for a winner.
Cibulkova 1-2 Vesnina*
Early break alert...
Elena Vesnina is 0-40 up and Dominika Cibulkova double faults.
First blood to the Russian.
*Cibulkova 1-1 Vesnina
The last women's quarter-final is now in play on Court One.
Dominika Cibulkova - the world number 18 - is up against unseeded Russian Elena Vesnina.
It's going with serve at the moment. Watch the match here.
Image source, PAS Williams 3-3 Pavlyuchenkova
John McEnroe
Three-time Wimbledon singles champion on BBC TV
That serve is the greatest weapon in tennis history in the women's side. An unbelievable weapon for her. Look at what she's done from 0-30. I've never seen a player come back from the brink of defeat as much as Serena Williams.
Image source, Getty ImagesS.Williams 3-3 Pavlyunchenkova*
Serena Williams racks up her sixth unforced error so far but recovers to 30-30 with a close-range smash.
The six-time champion then slams an ace down court to hold. Boom.
Image source, EPAV.Williams 7-6 (7-5) 6-2 Shvedova
*S Williams 2-3 Pavlyuchenkova
John McEnroe
Three-time Wimbledon singles champion on BBC TV
Fitness has been something that's been an issue with Pavlyuchenkova throughout her career. With as much talent as she had coming out of the juniors, the expectations, the pressure, too much... it's hard not to feel stress when you're out there.
I wasn't particularly good at dealing with stress often enough. it's taken her a while, 25. This could be a big turning point in her career. Williams is playing tight right now.
Image source, Reuters*S.Williams 2-3 Pavlyuchenkova
That's more like it from the world number one.
Serena Williams holds to love with a beautiful forehand into the corner.
And now she's taken the next game to deuce on Anastasia Pavlyuchenkova's serve.
But the Russian serves a 108mph ace to take the advantage and Williams backhands into the net. We're back level.
Image source, EPA*S.Williams 1-2 Pavlyuchenkova
Serena Williams pushes Anastasia Pavlyuchenkova hard on her service game, but mistakes from the American means the Russian holds for a second time.
Williams is looking a little stressed already, truth be told.
Image source, Getty ImagesV.Williams 7-6 (7-5) 6-2 Shvedova
Image source, ReutersVenus Williams speaking to BBC Sport's Rishi Persad after her quarter-final win over Yaroslava Shvedova:
"What a tough day on the court. The tie breaker felt like she would win. I felt like my opponent was on fire.
"I felt like the crowd enjoyed all the great points. She got them involved in the last game. We gave them good tennis today.
"I love playing the game. When you're winning matches it makes it that much sweeter.
On playing Angelique Kerber in the semis:
"It doesn't matter who your opponent is."
Here is the moment Venus saw off Yaroslava Shvedova from Kazhakstan to win in straight sets 7-5 (7-5) 6-2 and book her place in the semi-finals.
Venus Williams through to semi-finals
*S.Williams 0-1 Pavlyuchenkova
John McEnroe
Three-time Wimbledon singles champion on BBC TV
I am pulling for Serena. I think the stress that she handled last year was tough, during the US Open there was always talk about the Grand Slam and she deserves to make this happen.
It is going to be great for tennis if she ties Steffi Graf's record.
Image source, EPA#bbctennis
Monty Moncrieff: Wow! LOVING @Venuseswilliams being back in the semis at #Wimbledon What a champion. Will we see another final with her sister?
Martin McKay: @Venuseswilliams #legend hoping for an all Williams Final :D