Darcis, who once beat Rafa Nadal at Wimbledon, is the eighth player to retire in the men's singles at this year's championships.
If Federer is to be stopped from advancing to the last 16, Zverev will have to do something to disturb his cool.
"It was a big occasion for him", said Djokovic, 30.
While Federer might not be the same player today as he was back then, he still has the same nerves on tour and on court as he did when he first started; that might be the greatest sign yet that he isn't done celebrating victories on Centre Court.
The tournament will also serve as a trial for innovations created to speed up the game - tennis for the YouTube generation. Not the way he has been playing this year. Gulbis hopes to make the fourth round of a grand slam for the second time since 2015.
"That's a good point", the Serbian world No.4 said.
"I think this time I will try to go all or nothing, maybe even more than before". That's all I can say. "I don't necessarily need to agree with that but it's his right".
Cirstea questioned why it took so long for the medical team to arrive at Court 17 which is right next door to the tournament's famed Center Court. These things will surely happen, and they may even happen in the next round.
After dropping the opening set, Kerber trailed 3-1 in the second before turning things around.
"Look, you know, John has a complete right to say - anybody, really, in the world - has a right to say what they want, and I respect that right", Djokovic said.
"I mean, if you don't hit hard and fast, he's going to destroy you".
Against Djokovic, it will be much more hard to repeat this performance because Novak doesn't grant second chances to those who allow him to take the lead. Proper tennis. At least they see the two of us, who gave it all they had. And we're struggling to play well against him. The 32-year-old American was hurt early in the third set of a second-round match on Thursday.
As well as Nick Kyrgios - once the leader of the new generation with the potential to be so again - Australia have Thanasi Kokkinakis and Alex De Minaur, while it is an exciting time for Canada with teenagers Denis Shapovalov and Felix Auger-Aliassime promising a lot.
Top 10 seeds posting comeback wins were No. 6 Milos Raonic who defeated Mikhail Youzhny 3-6, 7-6 (7), 6-4, 7-5, and No. 8 Dominic Thiem who came back to beat Gilles Simon 5-7, 6-4, 6-2, 6-4, while No. 10 Alexander Zverev straight-setted American comer Frances Tiafoe 6-3, 6-4, 6-3.
Federer is tied with Pete Sampras and William Renshaw as a seven-time champion here. "Because it's not the right message to send out there from one of the most talented players that has played the game in the last six, seven years, and someone that was a hero to - he is a hero to - many children, especially in Australia".
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