Image source, PA Media

World number one Jannik Sinner has been speaking to Clare Balding on BBC One following his quarter-final win earlier today: "The main goal was to win the match, even if it goes to four or five [sets]. Mentally, you know that you have a few days off which is quite unusual during a tournament. Tomorrow is going to be a very relaxed day. Then on Thursday, getting back into rhythm and being ready on Friday.

"It was a good, solid performance today from my side. It's tough to play against Jan [Struff] because he's a big, big server. There wasn't a lot of rhythm and from the back of the court, it was really tough to find the right balance on court. I felt like in the important moments, I tried to play the best I can. The tie-break was very crucial, going up two sets to love was very important today.

"I'm more comfortable. Mentally, I knew that the first couple of matches, I'm coming here with no preparational tournament. It was something different but the outcome seems good. Today I felt like it was a small step forward in a good direction. Big serves are tough to break and beat on this kind of surface.

"I know I need to play the best I can on Friday. This is going to be a problem on Friday now. For now, switch off mentally and not think about tennis for a day."

On how he will rest: "I'm going to sleep for sure. I'm a big sleeper in the morning, I'm not a morning person. Let's see, it's going to be warm tomorrow, I'm trying not to waste energy."

On Flavio Cobolli and Jasmine Paolini also doing well at Wimbledon: "From an Italian point of view, it's good to have others in the tournament. Especially here in Wimbledon, the most prestigious tournament you have and to have three Italians fighting for it, it's amazing."

On Cobolli's next opponent, British wildcard Arthur Fery: "He had an amazing win, it was nice. A tough one for Grigor [Dimitrov] but it's a nice story. Finding himself in the quarter-finals of Wimbledon is very special."

Right, while we've got a couple of minutes, let's take the chance to get some reaction from a couple of matches earlier in the day.

Todd Woodbridge
Former Wimbledon doubles champion on BBC One

Novak Djokovic is right about the roof situation. There is at least another 40 minutes of sunlight, you can play a set of tennis within 40 minutes!

I'm a bit perplexed when every night we have played until a certain point.

Emily Salley
BBC Sport at Wimbledon

A huge cheer as Felix Auger-Aliassime wraps up the second set and levels this quarter-final.

It looks like the roof on Centre Court has just started to close, so there will be a bit of a break in play.

Novak Djokovic has packed up his bag and headed straight off court.

Interesting.

The roof is going to be closed and Novak Djokovic is not happy at all, he thinks the light is fine.

"We're an outdoor tournament," he argues.

It's not an argument he's going to win, though, and he trudges back to the locker room while the roof closes.

Image source, Getty Images

Nick Mullins
Tennis commentator on BBC One

Now the roar. Now the reaction. An ace at 123mph!

Where now for Novak Djokovic? The father and coach know that their boy is level!

Felix Auger-Aliassime gets himself out of trouble and wins the second set with an ace!

The third seed worked hard to get the break, nearly gave it straight back but clings on and draws level in the match.

Image source, Getty Images

Marion Bartoli
Former Wimbledon champion on BBC Radio 5 Sports Extra

Would you believe it?!

On Auger-Aliassime's worse shot, which is the backhand, he finds the inside of the line.

Emily Salley
BBC Sport at Wimbledon

Wow. Wow. Wow.

The Centre Court crowd are up on their feet, jumping up and down to applaud that Felix Auger-Aliassime winner. What a point.

Novak Djokovic stands with his hands on his hips, looking up to the sky in disbelief.

Todd Woodbridge
Former Wimbledon doubles champion on BBC One

Well Felix Auger-Aliassime didn't go for the magic tweener that time and he gets himself out of a massive hole!

What a point!

An incredible rally, Novak Djokovic comes forward and plays a brilliant lob.

Felix Auger-Aliassime looks done for as he plays a weak defensive lob but Djokovic's volley doesn't put him away.

The Canadian gets to it and plays a stunning backhand winner that lands on the line.

Having staved off the first break point, a double-fault from Felix Auger-Aliassime gifts Novak Djokovic another.

Felix Auger-Aliassime gets it back to 30-30 but a good lob from Novak Djokovic brings him break point.

Auger-Aliassime went for the tweener when he really could have just run around it. Pressure telling?

Image source, PA Media

Did you really expect Novak Djokovic to give it up easily?

It's 0-30 on the Felix Auger-Aliassime serve...

Leon Smith
GB Davis Cup captain on BBC Radio 5 Sports Extra and BBC Sounds

I said that Djokovic was acting so nonchalant and relaxed when he lost the previous game. He has lost concentration there.

Tim Henman
Former British number one on BBC One

Given Novak Djokovic's grass court record, and the physical demands being a little bit less on grass compared to the other surfaces, I would say this is his best opportunity for a 25th Grand Slam.

I do think there are less genuine contenders on grass as well.

Image source, Getty Images

Well, well, well.

Novak Djokovic double-faults looking for a big second serve and Felix Auger-Aliassime breaks.

The Canadian will serve for the second set.

Felix Auger-Aliassime keeps winning the first point on the Novak Djokovic serve. But, as yet, has not been able to ramp up the pressure from there.

He gets the perfect chance with a look at a second serve, runs around it but then booms the forehand long.

But hang on a minute, twice in a row Djokovic goes long and we have the first break point of the second set...

Nick Mullins
Tennis commentator on BBC Two

Unless my little umpire's scorecard is letting me down, Novak Djokovic has managed to win the first point just once in a Felix Auger-Aliassime service game so far.

It is monstrously hard to try to get it back - and certainly back on your terms. How impressive?

Leon Smith
GB Davis Cup captain on BBC Radio 5 Sports Extra and BBC Sounds

I hope Djokovic isn't so relaxed that he starts to lose focus and concentration.

Image source, Getty Images