- Venue: All England Club, London
- Date: 25 June - 8 July
Coverage: Live on BBC One, BBC Two, BBC HD Channel, red button, BBC Radio 5 live, mobiles, tablet and the BBC Sport website
Roger Federer had to overcome a back injury and the rain to beat Xavier Malisse in the Wimbledon fourth round.
The six-time champion had treatment during the first set, but sealed a 7-6 (7-1) 6-1 4-6 6-3 win after a 40-minute delay for rain.
"For Federer to be done, leave for home and have his team work on his back is a major advantage. When you are 30 you can't put five-set matches like his Benneteau match aside like you can when you are 20. He will now play his 33rd consecutive Grand Slam quarter-final. That's remarkable given that everyone gets up for them and there's a new generation of athletic players coming through. And he could become world number one again if he wins his seventh title."
"My back is OK, it started to feel better as the match went on," Federer told BBC Sport.
World number one
is also through to the last eight after beating Viktor Troicki in straight sets.
The Serb wasted little time in hammering his compatriot in 90 minutes, 6-3 6-1 6-3, to book a quarter-final meeting with either Richard Gasquet or Florian Mayer, who will complete their rain-interrupted match on Tuesday.
"It's never straightforward," Djokovic told BBC Sport. "You want to focus on every point because, at this stage the matches are getting more difficult. I think I played really well throughout the whole match.
"We know each other so well, the first match we played against each other I think he was nine years old and I was eight. It's never easy to play your good friends but there has to be a loser."
Federer, meanwhile, will meet 26th seed
in the last eight after the Russian overcame Denis Istomin 7-5 in the fifth set.
The Swiss will be playing in his 33rd consecutive Grand Slam quarter-final.
"That was scarily good from Djokovic. This was just what the doctor ordered. He looked unbeatable. This is going to be of concern for all the players left in the draw. This was never a match against Viktor Troicki. It certainly seems as though the French Open hangover has gone for Djokovic. Now he's in a situation where he's more comfortable."
After having to come from two sets down to beat Julien Benneteau in round three, Federer again looked in trouble as he left Centre Court for medical attention when 4-3 up in the opening set.
He returned to breeze through a tie-break and, after the rain, broke the serve of his Belgian opponent on three occasions in the second set.
But Malisse, the world number 75, hit back courtesy of a solitary break in the opening game of the third set.
He repeated the dose in the fourth, however Federer was not be taken to a decider, levelling things up then going 4-2 up with a decisive break that ultimately sealed his 850th career win.
"The back injury come and goes," he added. "When you play on tour for over 15 years the back does hurt at times, you just hope it doesn't come in a big match. It was scary, but the treatment was a big help."
"I'm very pleased that I came through, the rain delay helped me. I had to apologise to Xavier, it's a freak thing that happened.
"I've been doing exercises for years. I have a pretty good record with being injury free, so if this is the worst then I'm happy. I should be back fine on Wednesday."
Djokovic beats Troicki to reach quarters