Halep doesn't appear to be limping, but her movement is slightly impeded at the moment. Bouchard holds serve to 30.

Mike Henson
BBC Sport at Wimbledon

Image source, BBC Sport

"Mix up the slice." "Now he is hitting only slice."

Hitting with the world's best might seem like a golden ticket to most teenagers, but it is a demanding job for the youngster selected to supply groundstrokes fodder to Novak Djokovic.

The 2011 champion knows what he wants and isn't shy in asking for it...

World number one Serena Williams:, external I love you. Thank you for all the support. Words cannot express how much I love my fans and friends, and family. Yours always. Xxx S

Williams was forced to pull out of the ladies doubles, which she was playing with sister Venus, with what was described as a virus.

Super job from the trainer and Halep is back up on her feet. Time to get going again.

After assessing the nature of the problem, the trainer starts taping Halep's left foot. In the meantime, Bouchard is up on her feet and bouncing around on the service line to keep warm.

Bad news for Halep, the Romanian slides into a two-handed backhand and goes over on her ankle slightly. She looks like she stopped herself in time not to go over completely but she limps over to the chair, having conceded the game, to receive treatment.

We're two games in and Halep hasn't hit a single winner - but that's not her style. She plays a tight and consistent game - and it pays off as the errors flow off the Bouchard racquet. Halep breaks.

One double fault is a rare blemish in an otherwise clinical service game from Halep. Solid starts from both players on their respective serves. That'll calm the nerves.

Image source, Getty Images

The Royal Box is brimming with celebrities, with Cilla Black and Cliff Richard bumped into the second row behind Hollywood actor Colin Firth. But back to the tennis where Eugenie Bouchard comfortably holds to take an early lead.

Simon Halep, who will become the world number two if she wins, will receive first. If Eugenie Bouchard wins, she'll rise to at least seventh in the world, which will make her the highest-ranked Canadian ever. No pressure, then.

The players are out on court and are knocking up. Not long to go now...

John McEnerney:, external Bouchard to keep the Canadian flag flying over the weekend, don't think her compatriot will! Halep is tough customer but EB 2 win

Craig Fraser:, external It's all ova for Lucie Safarova, but it ain't ova for Petra Kvitova! Surely the favourite to win it now?

Mark Corner:, external Bouchard v Halep ... This should be the final! Going to be close, Bouchard for me - just.

Hamez Stevenson:, external Two of the stars of this year about to face-off in the #Wimbledon semi-final. Bouchard vs Halep. Expecting a cracking match.

Former French Open champion Virginia Ruzici from Romania, who is now Simona Halep's manager tells BBC Radio 5 Live: "We haven't had a semi-finalist since Ilie Nastase, which is a long time ago.

"She is a very talented player and that is what I saw in her six years ago when she won the French Open juniors. She is a natural athlete, very fast and moves easily without effort. But things have come fast in the last year with her reaching the French Open final. She played a fantastic match then and has come here full of confidence.

"That final will help her a lot here. Now she is more used to being on the Centre Court. Even though she lost in Paris, she played well. She needed a bit of adjustment with her footwork here but she is more mature and that should give her an advantage in this match."

Eugenie Bouchard, who faces Simona Halep in the semi-final later, on BBC Radio 5 live: The more I play big matches the better I feel in the next one. I definitely felt better in the French Open so the more I have those games the better I will feel when I am on court in the big matches.

"I love the tradition of Wimbledon and all the prestige that comes with it, I think it is my favourite tournament."

Canada Fed Cup captain Sylvain Bruneau: "We always believed in Eugenie but she has improved fast and is exceptional.

"She is very driven and self disciplined and loves the big stage and rises to the occasion and it gets the best out of her.

"We hope her and Milos Raonic will have an effect on getting more young players to play the sport in Canada."

Eugenie Bouchard, the 13th seed, on BBC Radio 5 live: "People tell me I am only 20 but it feels old to me. I want to do as well as I can as soon as I can.

"I am proud of what I have done but I am not satisfied. I want a Grand Slam and I am doing everything I can to get it."

John McEnroe
Three-time Wimbledon singles champion on BBC TV

"Eugenie Bouchard is more confident on the grass but Simona Halep had a good draw so that is giving her more confidence.

"If Halep wants to win she will have to see the ball early and react. It is nice to see someone of her height being able to do so well at this level."

Image source, Reuters

Li Na won the Australian Open, while Maria Sharapova triumphed in the French Open but the two players who have more Grand Slam match wins than anyone on the tour this year are Simona Halep and Eugenie Bouchard - with 15 apiece. Who will be the first to 16?

Tracy Austin
Two-time Grand Slam champion on BBC TV

"Petra Kvitova is just having a fantastic tournament. This is her first final of the year and is really starting to come into play. This has been the tournament of Safarova's life and she did a terrific job, especially in the first set and handled the situation beautifully.

It's nice to see such a big smile on Kvitova's face. It was difficult playing someone who she knows so well and she seemed to be more nervous at the start of the match but she handled it well."

We've got a little pause on Centre Court ahead of the second semi-final, allowing the crowd to head out and stretch their legs in the sunshine and recharge their glasses ahead of what has the makings of a very competitive match between Eugenie Bouchard and Simona Halep.