GB's Johanna Konta loses semi-final 6-4 6-2 to Venus Williams
Williams will seek a sixth Wimbledon title on Saturday
American will face Garbine Muguruza of Spain in final
Muguruza beat Rybarikova 6-1 6-1
Jamie Murray/Hingis reach mixed doubles semi-finals
But this is what Johanna Konta is up against.
The big-serving five-time singles champion Venus Williams, a player already a legend on these courts and still going strong aged 37.
Throw in six Wimbledon women's doubles titles as well and it is clear the American knows how to win on these courts.
Still feeling confident?
Tom Fordyce
Chief sports writer
Image source, Getty ImagesTwo years ago, Johanna Konta, approaching middle age in tennis terms at 24, was so lightly thought of as a championship contender that she required wildcards to play in Nottingham and Birmingham.
She had begun that year ranked 150th in the world, and would end her Wimbledon exactly where she had in each of the preceding three years - going out in the first round, the forgotten final paragraph of a report on someone else.
A late arrival, a worthy contender. For an unexpected star, Britain now expects.
BBC Two
Go, go, go!
Wimbledon is live on BBC Two!
I've got goosebumps watching this VT from Martina Navratilova.
This is going to be quite a day. Watch at the top of this page.
Reid 2-6 3-6 Olsson
All over!
Defending champion Gordon Reid is out of the men's wheelchair singles, beaten by Stefan Olsson who he beat in last year's final.
Image source, PAStefan Olsson beats reigning champion Gordon Reid
Jon Eleanor Oldroyd and Tony Livesey as they bring us live build-up the women's semi-finals - they have live commentary of Johanna Konta v Venus Williams from 13:00 BST.
Reid 2-6 3-5 Olsson
Britain's men's singles defending champion Gordon Reid is in trouble.
He's a set and a break down against Stefan Olsson who showed all his skill in the early stages.
Reid is now serving to stay in the match.
Watch it here.
"Lovely shot' from Olsson as reigning champion Reid struggles early on
Jonathan Jurejko
BBC Sport at Wimbledon
Image source, BBC SportJohanna Konta has the same demeanour during her morning hit as she has had all fortnight.
Smiley, relaxed... focused. The British number one has a quick chat at the net with coaches Wim Fissette and Andrew Fitzpatrick then warms up with a few gentle forehands.
The narrow gangways around court eight are packed with fans, journalists and grounds staff, all armed with cameras - on their mobiles or on a tripod - clicking away at Konta.
"Go on Joooooo!" shouts a female voice. Not even sure the sixth seed heard.
Image source, Getty ImagesFrom relative obscurity a couple of years ago, Johanna Konta's meteoric rise up the rankings over the last couple of years made her known to tennis fans but this year's Wimbledon has seen the 26-year-old come to the attention of the nation.
Her face is across the front and back pages of this morning's newspapers and her quarter-final win over Simona Halep attracted the biggest television audience of the tournament so far.
Is this the year of JoKo? Can she win her first Grand Slam title?
Simon King
BBC weather presenter and meteorologist
The weather has been near perfect for Wimbledon so far with only one day of significant rain and interruptions on Tuesday. Today will be another dry one with warm sunny spells and a top temperature of 23 degrees.
As for Friday’s forecast, it’s another dry one. Subtle difference will be a bit more cloud and a bit more breezy making it feel a tad fresher at 22 degrees.
Jonathan Jurejko
BBC Sport at Wimbledon
Image source, BBC SportA healthy crowd has already gathered around court eight, one of the snug playing areas in the shadow of Centre.
Why? Because all eyes are trained on this young man. He's Aidan McHugh, a 17-year-old from Glasgow.
McHugh is pals with the Murray brothers, hitting with world number one Andy over the Wimbledon fortnight. Not bad practice for the boys singles eh?
He's currently playing France's Matteo Martineau in the third round, with the tennis-hungry fans hoping they are watching a future British star.
Speaking of Gordon Reid, he and doubles partner Aflie Hewett, who took the title last year, have one of the best bromances in the game...
Watch here:
Current wheelchair singles champion Gordon Reid is struggling over on court 17 against Sweden's Stefan Olsson.
The 25-year-old has lost the first set 6-2 and has already been broken in his opening service game of the second.
Can he fight back?
'Lovely shot' from Olsson as reigning champion Reid struggles early on
Jonathan Jurejko
BBC Sport at Wimbledon
And here she is! Our first glimpse of Johanna Konta on the biggest day of her career.
The British number one arrives on court six - with Centre, where she will meet Venus Williams in a few hours, looming in the background - for a practice.
Security staff escort her in, politely asking people to move out of the way while media snappers frame their shots.
Image source, BBC Sport
Image source, Getty ImagesIf anyone predicted these four women's semi-finals before the tournament then I want them to choose my lottery numbers.
The quartet have eight Grand Slam titles between them, seven of those won by Venus Williams and one for Garbine Muguruza.
Johanna Konta is in just her second Slam semi-final and Magdalena Rybarikova her first.
Here is everything you need to plan your day of sofa slouching or sneaky tennis watching while your boss has their back turned.
Sue Barker and the gang will be on air on BBC Two from 12:30 BST with coverage across the BBC throughout the day. You can already watch live streams of the outside courts at the top of this page with wheelchair and junior players in action.
So here is what is coming up today on women's singles semi-final day.
The Centre Court action starts at 13:00 BST with Garbine Muguruza taking on Magdalena Rybarikova with Johanna Konta against five-time champion Venus Williams to follow.
The doubles competitions are also heading towards the latter stages with Jamie Murray and Martina Hignis playing British pair Ken Skupski Jocelyn Rae on Centre later.
The wheelchair events get under way today with plenty of British interest. More on that in a sec.
Image source, Getty ImagesGood morning everyone.
It is a long time since we have had a day like today.
Not since 1978 has a British woman woke up with a Wimbledon semi-final ahead of her.
How you feeling Johanna? Calm? Nervous?
What about the rest of you?
Image source, Getty Images"I've always believed in my own ability and I've always dreamt big."
Well it only gets one step bigger from here for Johanna Konta.
Today is the day she can become the first British woman to reach a Wimbledon final for 40 years.
Standing in her way a five-time champion.