Martina Navratilova
Nine-time Wimbledon singles champion on BBC TV

"This is now serious and the whole excitement goes up and your level of excitement goes up. Lucie Safarova has a great game for the grass and she deserves her place here."

So we have Petra Kvitova - a former Wimbledon champion, Simona Halep - the highest remaining seed, Eugenie Bouchard - the only player to reach the semi-finals in all three Grand Slams this year and Lucie Safarova - contesting her first-ever Grand Slam semi-final. Who's going to go all the way? You tell me.

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Piers Newbery
BBC Sport at Wimbledon

Image source, Piers Newbury

Piers Newbury on Twitter:, external "Beautiful day, from 13:00 BST: Kvitova v Safarova, Halep v Bouchard."

Image source, Getty Images

Second on Centre Court is the match that many observers are calling the virtual final.

Simona Halep has been in relentlessly good form this season reaching the final of the French Open and beating five top-10 ranked opponents this year - a number bettered by only Serena Williams and Maria Sharapova.

Fans of her opponent, Canada's Eugenie Bouchard, threw cuddly toys on court in the wake of her victories on her way the Australian Open semi-finals.

Image source, AP

First up is an all-Czech southpaw contest between Lucie Safarova (pictured) and Petra Kvitova. They may both call the same country home, both may hit left handed, both may now call Monte Carlo home, but there is gap in experience.

Safarova at 27 is in her first Grand Slam semi-final. Kvitova, three years younger, won the title back in 2011 after reaching the last four the year before. She knows which end of Centre Court to bow to.

Fortunately we have just the antidote to restore your pep and vim.

The sort of summer's day that you thought only existed in childhood memories and faded photographs and two women's semi-finals from way off the usual Wimbledon script.

Image source, Getty Images

LTA player development chief Bob Brett on BBC Radio 5 Live: "There is no question Andy is motivated and the role Ivan Lendl played was very important for his progression but having back surgery - it wasn't an easy time.

"He started to play better at the French Open, which was encouraging and he needs to find that sort of form.

"His serve last year was very effective and that has been a part of his game that is not as strong as before and hopefully he will get back to that level again.

"He definitely has the ability - he is not a number 10 in the world, he is much better than that. But this has been a difficult year for him and I hope over the next 12 months he will make significant progress.

"He hates to lose and when he looks at his performance he will be working hard."

Jeff Tarango
Former American tennis player on BBC Radio 5 live

"I think the hump of getting over the Olympic gold medal, winning his first Grand Slam and winning Wimbledon came all at once as a period of euphoria. There needs to be a time of normality again and that's without the change in coach and the back surgery."

Russell Fuller
BBC tennis correspondent on BBC Radio 5 live

"The concern for Murray is the contrast between the golden year he had up to winning Wimbledon and the past 12 months. Notwithstanding the back surgery, he has looked flat when he played the big matches."

Image source, Getty Images

Andy Murray's strangely subdued straight-sets surrender to Grigor Dimitrov, after four rounds of richly promising displays, is all the chatter in the gangways and walkways of Wimbledon this morning.

Even after a night to sleep on it, it is hard to add up pre-match form and expectations and come out with a comfortable two-hour win for the underdog as an answer.

The Daily Telegraph,, external the Times, external and the Guardian, external are among the newspapers to pick over Murray's on-court demeanour in search of clues to a disappointing day.

Image source, AP

Feel like something is amiss? Lacking enthusiasm? Energy levels running low?

Welcome to the morning after the day before.