Postpublished at 15:39 British Summer Time 11 July 2017
Williams 6-3 3-4 Ostapenko
A big, big hold of serve for the head-strong Jelena Ostapenko.
She drops just one point on her way to a 4-3 lead.
Summary
Johanna Konta beats Simona Halep 6-7 (2-7) 7-6 (7-5) 6-4 in quarter-finals
Konta is first British female in the semi-finals since Virginia Wade in 1978
She faces Venus Williams, who beat Ostapenko 6-3 7-5, in last four
Rybarikova beats Vandeweghe 6-3 6-3
Muguruza beats Kuznetsova 6-3 6-4
Djokovic beats Mannarino to reach men's last eight
Postpublished at 15:39 British Summer Time 11 July 2017
Postpublished at 15:37 British Summer Time 11 July 2017
*Rybarikova 2-1 Vandeweghe
Vandeweghe likes those double faults eh?
She looks set to seal the game to love but then double faults. But the American, who also reached the 2015 quarter-finals, regains composure to hold. That should settle the mild jitters.
Her coach Pat Cash looks pensive.
There are spectators arriving late - and looking a little sheepish. Tut! Tut!
Image source, PAWatch Muguruza's winning momentpublished at 15:37 British Summer Time 11 July 2017
Garbine Muguruza won in straight sets so she has still just dropped one set in the Championships so far and that was to number one seed Angelique Kerber in the last round.
Media caption, Watch Muguruza's winning moment
Postpublished at 15:37 British Summer Time 11 July 2017
Martina Navratilova
Nine-time Wimbledon singles champion on BBC OneThey are both hitting the ball so cleanly and right in the middle of the racquet, with a little more power coming now from Ostapenko.
Ostapenko breakspublished at 15:37 British Summer Time 11 July 2017
Williams 6-3 3-3 Ostapenko
Media caption, Ostapenko delivers skillful winner
Williams' concentration lapses when she volleys into the net for 0-15 and then lands a double fault.
The American follows it up with an ace. That'll do.
Ostapenko edges ahead with a banging forehand winner and has break point when Williams nets. Another big opportunity for the mini 20-year-old.
It's handed to her on a plate after another Williams double fault.
Interesting developments on Centre Court...
Image source, Getty ImagesPostpublished at 15:31 British Summer Time 11 July 2017
Williams 6-3 3-2 Ostapenko
Ostapenko gets her head back in the game and moves to 40-15 with a clean, crisp forehand winner.
Williams sends her opponent running all over the grass on the next point, and Ostapenko shoots long.
The Latvian does hold, though, when Williams nets.
Image source, AFPPostpublished at 15:29 British Summer Time 11 July 2017
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End of twitter postVandeweghe broken in first gamepublished at 15:29 British Summer Time 11 July 2017
*Rybarikova 1-0 Vandeweghe
Will Coco pop? Or will Magdalena...? Ahh, give up.
Anyway, this is arguably the biggest match of the careers of these two. OK, so Vandeweghe got to the Aussie semis - this is Wimbledon!
It's 25-year-old American Vandeweghe - coached by former singles winner Pat Cash, who she calls a "geek" because of his taste in music - to serve first.
Rybarikova, 28, canters into a 30-15 lead - a first game break?
Vandeweghe salvages and is a point away from holding but then she dishes up a double fault.
Deuce then advantage Rybarikova - break point. Saved.
Then another break point with Coco applying a little too much on her forehand from the back.
The American is under pressure. A second double fault sees the Slovak break - she didn't have to work for that.
Image source, PAMedia caption, Impressive shot from Rybarikova
Postpublished at 15:29 British Summer Time 11 July 2017
Williams 6-3 3-1 Ostapenko
Jelena Ostapenko picks at her green-blue painted nails and mutters to herself as she's completely overwhelmed by Venus Williams' powerful serve.
It looks like the American is going to hold to love, but she makes a couple of errors before holding again when Ostapenko's forehand goes past the chalk.
Image source, Getty ImagesWilliams breakspublished at 15:25 British Summer Time 11 July 2017
Williams 6-3 2-1 Ostapenko
Ostapenko's going to be so annoyed with herself.
The 20-year-old wasted a break opportunity in the last game and now she's been broken to love on her own serve.
Williams is storming ahead.
Image source, Getty ImagesPostpublished at 15:22 British Summer Time 11 July 2017
Nick Mullins
BBC commentatorIt sounds like a rock concert - the battle of the drummers, underneath the roof of Centre Court right now.
Postpublished at 15:22 British Summer Time 11 July 2017
Martina Navratilova
Nine-time Wimbledon singles champion on BBC OneI've not seen Venus Williams hit the ball this hard in a long time.
Williams saves break pointpublished at 15:22 British Summer Time 11 July 2017
Williams 6-3 1-1 Ostapenko
A sliced forehand return sees Ostapenko grab a point off Williams' serve for 30-15.
And then the five-time champion nets. A chance at last for the Latvian.
Ostapenko lands a forehand winner after a powerful rally. She's got break point!
Question is: can she take it? Not this time.
We go to deuce and Williams nullifies the danger to hold.
Image source, PAPostpublished at 15:18 British Summer Time 11 July 2017
Postpublished at 15:17 British Summer Time 11 July 2017
Williams 6-3 0-1 Ostapenko
Ostapenko landed just 44% of her first serves in the first set. She must raise that if she doesn't want to say goodbye today. She starts the second set in solid fashion though, winning the game with a wonderful forehand down the line.
Centre Court like that!
Image source, AFP'It means a lot to be back in the semis'published at 15:17 British Summer Time 11 July 2017
Muguruza 6-3 6-4 Kuznetsova
Image source, EPAWimbledon semi-finalist Garbine Muguruza speaking to BBC Sport: "I was clear what I had to do. I'm happy it worked out.
Are you an improved player from the last time you were in the semi-finals in 2015?
"It seems far away from that. I'm more competitive. It's a big change.
"It means a lot to be back in the semis. It was my breakthrough year."
"It doesn't matter who I face because they're all playing great."
Postpublished at 15:15 British Summer Time 11 July 2017
Martina Navratilova
Nine-time Wimbledon singles championWhat a fantastic set from Venus. Solid as a rock.
She got 68% first serves and won 80% of the points.
It's hard to find an opening. Ostapenko's got to find a way to get into Venus's serve.
Image source, EPAGame and first setpublished at 15:13 British Summer Time 11 July 2017
Williams 6-3 Ostapenko
Venus serving for the set after 27 minutes. It's 20 years since her Wimbledon debut and she looks totally at home out there.
Ostapenko pushes a shot long to bring up two set points and while she saves one with another powerful strike she can't get on the next serve and just like that, set won.
Image source, AFPPostpublished at 15:10 British Summer Time 11 July 2017
Mary Pierce
Former French Open champion on BBC Radio 5 liveIt makes such a difference when Ostapenko gets good first serves in. She can take advantage of Venus' return.
Postpublished at 15:10 British Summer Time 11 July 2017
Williams 5-3 Ostapenko
Ostapenko serving to stay in the set, new balls please. A big first serve too, forcing Venus to just paddle it back long.
Venus comes in a yard to meet the next one but can't get that back either. This is good serving from the Latvian, the youngest player left in the draw. She goes 40-0 up but then misses a few first serves and Venus punishes her second serve down the line. 40-30, pressure on, net!
Another missed first serve, only landing 46% at the moment, but she carves a winner down the line. Held!
Image source, PA