Novak Djokovic wins longest Wimbledon quarter-final in history to secure place in 15th semi-final at SW19
Djokovic beats Felix Auger-Aliassime 7-6 (12-10) 3-6 6-3 6-7 (4-7) 7-6 (10-4) in extraordinary match lasting five hours and 15 minutes
Seven-time champion Djokovic, 39, had treatment for left calf problem in first set but battled on to keep alive hopes of a 25th Grand Slam title
Djokovic, the oldest men's semi-finalist in 50 years, will play defending champion Jannik Sinner next after he beat Jan-Lennard Struff
Karolina Muchova knocks out Naomi Osaka to set up semi-final against Coco Gauff
Gauff overcame fourth seed Jessica Pegula to reach her first Wimbledon semi-final
Alexander Zverev beats Jiri Lehecka in four sets to reach quarter-finals
Sinner 7-5 4-4 Struff*
Jan-Lennard Struff attacks Jannik Sinner's second serve and follows his return into the net, but Sinner nails a backhand pass. He cocks his head to watch the ball's trajectory as it kisses the tramline. 15-0.
Struff nicks a point back at 40-0, sneaking into the net to gobble up a sliced backhand, but Sinner secures the hold with an ace.
*Pegula 6-4 1-2 Gauff
Tracy Austin
Two-time Grand Slam champion on BBC One
Coco Gauff's second serve has been problematic today. She has served six double faults so far and she is only winning 37% of her second serve points as of now.
It isn't helpful when playing against one of the best returners in the game.
Image source, Getty Images*Pegula 6-4 1-2 Gauff
Image source, Getty ImagesCoco Gauff's shoulders slump after another double-fault to hand Jessica Pegula another break point.
She clips the line with a sliced approach shot before finishing the point at the net to save it before a finding a very timely ace.
She then hammers an overhead volley in and lets out a roar. Another big hold for Gauff. They all feel big the way things are going.
*Sinner 7-5 3-4 Struff
Jan-Lennard Struff opens his service game with a double fault and finishes it with an ace down the T. Hold to 15.
Pegula 6-4 1-1 Gauff*
Tracy Austin
Two-time Grand Slam champion on BBC One
When you hit to Jessica Pegula, you pretty much know what you're going to receive.
It will be a hard and flat ball because she likes to hit it early, she has great timing and she has improved her movement.
She is one of the greatest competitors alongside Coco Gauff. No matter what the score is, she is engaged in every point. She has that aura and that respect as well.
Sinner 7-5 3-3 Struff*
Ace for advantage and this time, Jannik Sinner comes through to hold with Jan-Lennard Struff sending a second-serve return long.
Pegula 6-4 1-1 Gauff*
Fighting back to hold in the last game seems to have fired up Coco Gauff.
Jessica Pegula is up 40-15 but Gauff doesn't give it up and as she charges in to meet a slack drop shot from Pegula, whipping the ball down the line for a winner, she's got a break on her mind.
But fourth seed Pegula, as she has throughout this match, stays calm and pushes through to hold.
Encouragement for Gauff, though.
Image source, Getty Images*Sinner 7-5 2-3 Struff
Ace for advantage.
Double fault for deuce.
*Pegula 6-4 0-1 Gauff
Harry Poole
BBC Sport at Wimbledon
The crowd are trying their very best to lift Coco Gauff, who looked to the sky before having a word with herself after handing Jessica Pegula those two break points.
There are huge cheers for the 22-year-old as she comes out on top in the best rally of the match, and again as she escaped what would have been a rather dispiriting start to the second set.
Can she find a way to build on that?
Image source, PA Media*Sinner 7-5 2-3 Struff
What a gift from Jannik Sinner. Jan-Lennard Struff dabbed an overhead short over the net and reacted sharply to Sinner's first volley. However, the Italian's second was tame and Struff gleefully pounded a forehand pass down the line. What was the top seed thinking? 15-30.
Down 40-30, Struff nails a cross-court pass with Sinner at full stretch on his forehand.
*Pegula 6-4 0-1 Gauff
That is a huge hold for Coco Gauff!
Down 15-40, it looked like being the worst possible start to the second set but the grinds it out to deny Jessica Pegula.
It's summed up by the point on the second deuce as Gauff scrambles brilliantly to stay in it then gets back to not only reach Pegula's lob but fire backhand winner down - and onto - the line.
*Sinner 7-5 2-3 Struff
Image source, Getty ImagesUp 40-0, Jan-Lennard Struff hits two backhand unforced errors. Eek.
No drama for the German - he bangs a big serve onto Jannik Sinner's backhand and watches as the sprawling top seed puts the ball into the net.
Sinner 7-5 2-2 Struff*
Emily Salley
BBC Sport at Wimbledon
A first break point for Jan-Lennard Struff gives the crowd a reason to cheer and whistle, and the noise goes up another level or two when Jannik Sinner fires long.
They did seem to be on Sinner's side in the first set, but you can't blame them for favouring the underdog now.
Pegula 6-4 0-0 Gauff*
Harry Poole
BBC Sport at Wimbledon
The task is simple, in theory, for Jessica Pegula as it stands.
The 32-year-old just needs to stay more consistent than Coco Gauff and she should come through this, because her compatriot just can’t find a rhythm here.
Four double faults, 17 unforced errors to just six winners, a first serve percentage of 59%.
Gauff must dust herself down and try and reset. If she can’t, her best Wimbledon run ends here.
Sinner 7-5 2-2 Struff*
Well, I didn't see that coming. Jannik Sinner is visibly furious as he messes up a forehand to throw away his second-set lead.
Image source, Getty Images*Sinner 7-5 2-1 Struff
Slightly nervy moment for Jannik Sinner as a double fault gives up 0-30.
He responds by coming on the approach off a wide serve and walloping a forehand winner from the service line. With an almost identical set-up, he levels the game.
He tries for three in a row but this time Jan-Lennard Struff reads it. Sinner ends up back-pedalling for a smash and completing a full retreat to the baseline before spraying a backhand out.
Pegula 6-4 0-0 Gauff*
Image source, Getty ImagesJessica Pegula is a set away from the semi-finals.
She holds to 15 and has been the more assured of the two to this point.
Coco Gauff went down swinging in that last game, attempting the big shots but it doesn't come off for her. A total of 17 unforced errors tells the story for the two-time Grand Slam winner.
*Sinner 7-5 2-1 Struff
Andrew Castle
BBC Sport tennis commentator on BBC Two
Jan-Lennard Struff leads the table in terms of unforced errors. It isn't surprising though because he has been on the court longer than anyone else in this men's singles draw. He has also got more aces than anyone else, which isn't surprising, but he could have done with a few there.
Jannik Sinner is in very firm control. It isn't total control, but nothing Struff is doing is suprising him anymore.
Image source, PA Media*Sinner 7-5 2-1 Struff
Another serve and volley attempt doesn't come off. Jannik Sinner spins round to offer a clenched fist to his box.
Momentum has well and truly swung in this match.
*Pegula 5-4 Gauff
Pat Cash
Former Wimbledon champion on BBC Radio 5 Live
The ladies tend to get down really low, the guys tend to just drop the head of the racquet.
The way Gauff just moved into the net, that was the crucial thing.
