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Rafael Nadal beaten by Frances Tiafoe 6-4, 4-6, 6-4, 6-3
World number one Iga Swiatek beats Jule Niemeier 2-6 6-4 6-0
Swiatek will play Jessica Pegula who defeated Petra Kvitova 6-3 6-2
Cameron Norrie loses 6-4 6-4 6-4 to Andrey Rublev in last 16
Collins v Sabalenka followed by Cilic v Alcaraz in night session (midnight UK)
Day eight of final Grand Slam of year at Flushing Meadows
*Nadal 1-1 Tiafoe
Lovely shot. Rafael Nadal follows up a fine first serve with a curved forehand into the corner which wrong-foots Frances Tiafoe.
But Tiafoe springs into action, shuffling into the net to pop away an angled volley in response for 30-15.
Purcell/Ebden 1-2 Koolhof/Skupski
Cameron Norrie might have fallen but there are still a smattering of Brits in the doubles events.
Neal Skupski is one - he and Dutch partner Wesley Koolhof are currently taken on Aussie duo Max Purcell and Matthew Ebden in the men's round of 16.
Purcell and Ebden lifted the Wimbledon title together earlier this year, but things are on serve in the early stages at Flushing Meadows.
*Nadal 1-1 Tiafoe
The court is now entirely covered in shade, which will be a huge relief to both players in incredibly humid conditions in New York.
That's nice and cool from Frances Tiafoe. The American ticks off a love hold to quickly level at the start of this match. Encouraging start!
Nadal 1-0 Tiafoe*
Frances Tiafoe looks annoyed at himself after just missing the line with a cross-court backhand, having been allowed a look at a second serve at 30-30.
It means Nadal is able to wriggle free to safety in his opening service game.
*Nadal 0-0 Tiafoe
A nice, clean start for Rafael Nadal as an ace takes him to 30-0, but there's a big cheer from the crowd as home favourite Frances Tiafoe gets on the board following a Nadal mis-hit.
Mumbles in the crowd follow a double-fault from the four-time champion.
*Nadal 0-0 Tiafoe
Rafael Nadal is going to get things under way on Arthur Ashe.
The US Open's main stage looks nice and full for this one.
Away we go!
Nadal v Tiafoe
Laura Robson
Former British number one at Flushing Meadows
Frances is playing much more consistent tennis. His coach (Wayne Ferreira) told him to really knuckle down and learn how to play some disciplined tennis. he has put the hard yards in and believes in himself a lot more.
Nadal v Tiafoe
Rafael Nadal has won both his previous meetings with Frances Tiafoe, doing so in straight sets.
Those two previous matches came in 2019, at the Australian Open and the Madrid Open.
"I'm definitely a different player from 2019," Tiafoe said.
"[I'm] playing much better. Now I believe I can beat him. I'm definitely going to come after him.”
Image source, Getty ImagesNadal v Tiafoe
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Almost.
The players are out and just going through their final warm-up drills.
We'll be under way shortly!
Nadal v Tiafoe
Frances Tiafoe is bidding to become the youngest American men's player to reach the US Open quarter-finals since Andy Roddick in 2006.
The 24-year-old has been in fine form so far, coming through all of his matches - including against Argentine 14th seed Diego Schwartzman in the previous round - in straight sets.
He's never before reached the last eight at his home Slam.
Image source, Getty ImagesNadal v Tiafoe
There have been some concerning moments for Rafael Nadal at the US Open so far, not least when he trailed Fabio Fognini by a set and a break in round two.
But his following win over Richard Gasquet, in straight sets, will have felt very nice indeed.
"My best match in the tournament," said Nadal. "It's easy to say that because the other day was tough. But important improvement.
"I need to keep going. It's a good victory for me. I went through some difficult moments. That's something that is good, that I went through that and [I was] safe with positive feelings."
Image source, Getty ImagesThe quarter-finals burst into action on day nine of the 2022 US Open.
Up first on Arthur Ashe it's Italy's Matteo Berrettini up against Norway's Casper Ruud, who could yet end the tournament as the world's top-ranked men's player.
Tunisian Ons Jabeur's last-eight meeting with Australia's Ajla Tomljanovic follows that match.
American Coco Gauff and France's Caroline Garcia kick off the night session, before Australian Nick Kyrgios takes on Russia's Karen Khachanov.
Nadal v Tiafoe
After slow starts to his opening matches against Australian wildcard Rinky Hijikata and Italian Fabio Fognini, Rafael Nadal faced no such problems as he recorded his first straight-set win of the 2022 US Open against Spaniard Richard Gasquet to reach the fourth round.
It means he is 22-0 at Grand Slams this year. Who knows what he might have achieved had he not been forced to withdraw from his Wimbledon semi-final with injury...
Image source, Getty ImagesNadal v Tiafoe
Image source, Getty Images
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Either top seed Iga Swiatek or Jule Niemeier will stand between Pegula and a maiden Grand Slam semi-final.
Pegula 6-3 6-2 Kvitova
The American number one reaches the quarter-finals of the US Open for the very first time!
She was oh so clinical, staying in rallies and forcing errors from Czech 21st seed Petra Kvitova.
The eighth seed has now reached the last eight at a Grand Slam for the third time this season.
Pegula 6-3 5-2 Kvitova*
Another unforced error. A first match point for American Pegula.
Pegula 6-3 5-2 Kvitova*
Under pressure Petra Kvitova hits the net with a backhand.
30-30, Pegula could get to match point.
Pegula 6-3 5-2 Kvitova*
One-way traffic now as Pegula cruises through her latest service game.
She is sprinting toward a place in the quarter-finals.
*Pegula 6-3 4-2 Kvitova
It's all going wrong for Kvitova very quickly at the moment as a failed serve and volley gives Pegula triple break point.
She saves the first but can't finish off a lengthy rally next point, hitting a forehand long.
Pegula is now a set and a break up.