21 - and 21 days, Khachanov is the youngest man to reach the last-16 at Roland Garros since Marin Cilic made the fourth in Paris aged 20 years 252 days in 2009.
"I think the rain helps me a lot, because I was really down in the fourth set and mentally I wasn't ready", admitted Nishikori.
"Everything wasn't ideal. There were a few concerns", Mladenovic said, before joking: "I made about 35 double-faults today, but everything's OK!"
Congrats to k. Mladenovic.@GarbiMuguruza very proud of you.Never simple to be defending champion.To the French crowd, pathetic, no class! I think for the tournament, for the crowd, for us.
"My hand's been sore for about three or four days, since the day I played doubles here", Stosur told AAP.
"I keep getting the same questions over and over again, are you under pressure and everything".
"It's still there. I mean, it's obvious that I have some struggles still, especially with my serve", said Mladenovic.
"I am surprised that I'm in the fourth round here", Pliskova said after her match. But that's the only thing that happened.
"They were quite fair". Serena is on maternity leave, Petra Kvitova is in the early stages of her return and Victoria Azarenka is likely to be underdone as she comes back from the birth of her first child.
Mladenovic played her part in the noise, repeatedly shouting 'Forza!' [an Italian rallying cry] while she also revved the crowd up on multiple occasions.
UAE ruling family member: Qatar now questioning its leaders
Egypt , the UEA and Saudi Arabia all responded by blocking Al Jazeera , a Qatari state-funded TV station, in their own countries. The US was not informed of the decision until just before it was announced , the State Department has said.
"I obviously was a little bit nervous", Muguruza said.
Anointed as the player to take over Williams' mantle, Muguruza has subsequently failed to reach a single final at any tournament. It was a similar pattern - she did not really impress in Stuttgart and at her home tournament in Madrid before a flurry of form in Rome and then her run to the French Open title. "I love playing in front of you. I'm sure that when we go to the United Kingdom to play, they will do a great job, too".
But ultimately the rest of her game made up for it, although there must be a concern that she has expended too much emotional energy to go all the way. Add it up, and it means that there will be a first-time major title victor at the end of the tournament.
Venus Williams lost her fourth-round clash against Timea Bacsinszky 5-7 6-2 6-1, marking the second year in a row that she has fallen to the Swiss at Roland Garros. "I understand. I just think that they were a little bit - sometimes should be a little bit more respectful", Muguruza said, noting that the chair umpire repeatedly had a hard time quieting the premises. As the 11th seed, on her least-effective surface, anything more would have been a bonus.
"It's not flawless, there are little problems but I fight as I can".
The number 30 seed reached the semi-finals here in 2015 while Mladenovic is playing in only her second grand slam quarter-final.
Who got upset Sunday at Roland Garros, besides more than half the players in action?
Wozniacki is in Paris with National Basketball Association star boyfriend David Lee, and she believes happiness off the court is a factor in her form.
"I have great support. It's nice to know that they have my back no matter what".