All the attention will be on Andy Murray's five-set loss to Sam Querrey, but there is a great encounter going on over on Court One at the moment.

This one has also gone into a fifth set after Luxembourg's Gilles Muller, the man who beat Rafael Nadal in the last round, has just held his serve to take the fourth set against Marin Cilic.

Muller wasted two set points, but takes the third as a Cilic return is too long. Into a decider.

Stephanie Siu: Andy's hips were not lying those last two sets. So sad

Michael Hodges: I think Andy will take the rest of the season off to try and regain full fitness

Matthew Okot: Far be it from me to disagree with McEnroe but surely Querrey beating Novak The Invincible last year was his biggest win?

Tim Henman
Former British number one on BBC TV

We know how hard Andy Murray pushes himself. I think, in hindsight, he needed a little bit more time between Miami and Abu Dhabi. He ended up playing the Australian Open with shingles at the start of 2017 and probably didn't give his body enough time to recover. He's always been playing catch-up. It's been a difficult year for him.

American Sam Querrey says he is 'still in shock' after beating Andy Murray in the quarter-finals.

Meanwhile, over on Court One, Gilles Muller has just broken the serve of Marin Cilic and will be serving for the fourth set.

Cilic is two sets to one up and the winner meets American Sam Querrey.

Image source, Getty Images

Tim Henman
Former British number one on BBC TV

I think Andy knew the writing was on the wall in the fourth set. You can see by his movement there there's no real chance for him to chase down the ball. Given the circumstances, the schedules, there are tournaments you'll be injured in and have to pull out. But as the defending champion, at the home Slam - it's not the circumstances you want to go out in.

There's not a great deal you can do, especially if you've been treating the injury for so long. It's something he's been battling. Over a two-week event sometimes injuries can improve, and you can run them off, but this one has deteriorated. Those last two sets we saw how much it hampered his game.

Milos Raonic is bidding to reach his fourth Grand Slam semi-final. If he does, he'll be the first Canadian player – man or woman – in history to make that many.

He's had a much tougher run-in to the quarter-finals, spending double the amount of time on court compared to Roger Federer - 10 hours, 41 minutes up against five hours, 40 minutes.

Tim Henman
Former British number one on BBC TV

Image source, PA

The movement is a hindrance physically but I think it's also a distraction mentally. Murray was up a set and a break but you can see lots of the movement today - he was hobbling, trying to change direction, the hip joint was uncomfortable. At this level and stage of the tournament you know you have to be, if not 100%, close to 100% fit.

You see the average serve speeds, Murray was a long way down. Without being able to use both legs – the hip is so important. A physical issue then becomes a distraction and even though Querrey was down two sets to one, you still felt he had the energy to keep making Murray work.

Miles Maclagan
Former British Davis Cup player on Radio 5 live sports extra

We were talking about how emotionally tired he was from his efforts in 2016. Now I’m sure he’ll sit down with his team and this is where the experience of Ivan Lendl comes in, as to what to do when you’re tired. We’ve seen Roger Federer take time out and he looks great. We’ll see what Andy’s next steps are.

Tim Henman
Former British number one on BBC TV

Querrey was very clear in his game plan. He wanted to be offensive. You could see how laboured Murray was. If you can’t get there, it’s going to be very, very difficult.

Querrey has been on the tour many times, he's had big wins in his career. This is the biggest one on the biggest stage. He stayed focused on his own game and knew the aggression and taking time away from Murray was the right way to play.

Querrey has had some long matches but he has a day off tomorrow to ensure an easy day and then get ready for Friday.

Andrew Castle
BBC Sport tennis commentator

Certainly physically, Andy Murray is not right. Sam Querrey - a piece of tennis history for him. Nobody has ever had to wait longer for his first Slam semi-final and it's at Wimbledon, where he has done so well in the past.

Image source, Getty Images

Sam Querrey speaking to BBC Sport after his win over Andy Murray: "I'm still in a bit of shock myself. That last point, I was so happy to get the serve. I'm thrilled right now.

"I didn't start my best but I kept with it, kept swinging away, then really found a groove in the fourth and fifth set and then everything started falling my way.

"It feels great - this is a dream come true, to be in the semi-finals and to have it at Wimbledon makes it feel more special. I'm going to enjoy this win a little bit longer, then have an easy day tomorrow and get ready for the semis."

Tim Henman
Former British number one on BBC TV

Querrey beat Djokovic last year, we've seen the damage serving can do when Muller put out Nadal. You have to give him credit for the level of tennis he played but there's a big question mark over what has been Murray's fitness over the past three or four weeks.

To see him in so much discomfort, it's pretty evident it's deteriorated and movement is such an important part of Murray's game.

Stefan Edberg
Swedish former world number one

Obviously it was tough out there for Andy and he was hurting a little bit. He was up against a player who was playing extremely well.

It was tough out in the fifth but you must hand it to Sam, he was playing so well.

It's a pity for Andy but that's the way it goes sometimes in sport.

Image source, Getty Images

Paul Christie: Admirable or foolish to continue when Injured? Nice gesture for Querrey but looks like he may have done lasting damage to his hip

Monty: Painful to watch the end of that match, though not as much as it must feel for Murray

Tina Knights: And all of a sudden, the hopes of a nation unexpectedly rest on Johanna Konta's shoulders.

Sam Querrey breaks Murray to go 5-1 up - see how Murray was struggling to move around the court because of his hip problem.

Sam Querrey will now face either Gilles Muller or Marin Cilic in the semi-final.

Don't forget you can watch that match at the top of the page.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

I anticipate Murray will be taking some fairly significant time off to at least try and get that back on track. Querrey? It's the greatest win of his life, especially considering the circumstances.

Image source, Getty Images

Mats Wilander
Former world number one on Radio 5 live

It's heroic that he's out here playing when you can see, at times, when he was running, that he was hampered by his hip.

I still think his title defence was a good effort and he's still potentially hanging on to the number one ranking - unless Djokovic wins it.

It's heartbreaking to see him out there suffering.