US Open day seven - listen to BBC Radio 5 Sports Extra commentary (UK only)
Two-time defending champion Aryna Sabalenka overcomes shaky first set to win 6-4 6-3 against home hope Taylor Townsend
LIVE: Wimbledon champion Linda Noskova faces Marta Kostyuk in rematch of SW19 semi-final
Sabalenka must win title - and hope Elena Rybakina loses before semi-finals - to keep world number one ranking
Carlos Alcaraz against American Tommy Paul (19:00 BST)
Second seed Alcaraz bidding for third New York title and eighth major overall
GB's Harry Patten into third round of doubles alongside Finland's Harri Heliovaara
*Kostyuk 4-4 Noskova
Image source, Getty ImagesMarta Kostyuk has been one of the form players in 2026, winning the WTA 1000 event on the clay in Madrid and following that up with runs to the semi-finals of both the French Open and Wimbledon.
She gets a chance to break back straight away when Linda Noskova smashes an overhead into the net, and then takes it as Noskova nets a volley from Kostyuk's attempted passing shot.
Kostyuk 3-4 Noskova*
Marta Kostyuk goes well wide with a forehand on break point down and Linda Noskova breaks for a 4-3 lead in the opening set.
Czech player Noskova lost fairly early on in Toronto and Cincinnati after winning Wimbledon, but she's back at the business end of another Grand Slam.
Kostyuk 3-2 Noskova*
Image source, ReutersThis match is a repeat of the semi-final at Wimbledon a couple of months ago, which Linda Noskova won en route to winning a maiden Grand Slam singles title.
Noskova and Marta Kostyuk swapped breaks at the start of the match and it's been on serve since then, with Ukrainian Kostyuk leading 3-2.
Sabalenka 6-4 6-3 Townsend
Women's top seed Aryna Sabalenka, on the challenges opponent Taylor Townsend presented in their fourth-round match: "What an incredible player she is approaching the net. A great returner, moving well, very brave.
"You can see how focused she was, and it was really challenging playing her, especially here. Thank you so much [to the crowd] for being so respectful to me. I knew coming into this match that you guys would be on her side, but you were sometimes cheering for me and I really appreciate that.
"I'm happy to be through against this really tough opponent."
On falling a break down in the second set: "I was like OK, you were down the break, just try to return the serve and put as much pressure on her as possible basically.
"I was just trying to stay focused on myself, not only point by point but ball by ball.
"I'm happy I was able to turn around the second set, I think it was a key moment."
Image source, Getty ImagesKostyuk 2-1 Noskova*
Image source, ReutersAryna Sabalenka got through her fourth-round match in an hour and 15 minutes, and it means the crowd on Arthur Ashe Stadium will have to wait about an hour before they see defending men's champion Carlos Alcaraz in action.
Sabalenka will play the winner of the match currently on Louis Armstrong Stadium between Linda Noskova and Marta Kostyuk, which is on serve at 2-1 in the first set.
We'll have updates of that match shortly, along with reaction from Sabalenka and build-up to the Alcaraz match against American Tommy Paul.
Sabalenka 6-4 6-3 Townsend
Image source, ReutersAryna Sabalenka says in her on-court interview that Taylor Townsend's qualities make it "really challenging" to play her, before thanking the crowd on Arthur Ashe Stadium for their support.
Full quotes to come from the defending champion.
Sabalenka 6-4 6-3 Townsend
Image source, ReutersAryna Sabalenka wins again in straight sets and is into the last eight of the US Open.
There's a stroke of fortune for the world number one on match point as her return appears to clip the top of the net and the advancing Townsend can't get to a volley near her feet.
A warm embrace at the net between the players and Taylor Townsend gets an excellent ovation as she leaves the court, her hopes of a first Grand Slam singles quarter-final coming to an end today.
Sabalenka 6-4 5-3 Townsend*
Taylor Townsend drills a backhand down the line to save the first match point.
Great shot.
One more to come...
Sabalenka 6-4 5-3 Townsend*
It's a tremendous way for Aryna Sabalenka to start the game - a cross-court backhand winner.
It puts her on course for two match points...
Sabalenka 6-4 5-3 Townsend*
Aryna Sabalenka cruises through a service game - a rarity in this match - to move within one game of the last eight.
*Sabalenka 6-4 4-3 Townsend
Image source, ReutersThree straight games for Aryna Sabalenka, two of them breaks of serve, have swung the momentum back in favour of the defending champion.
She is nearing a place in the quarter-finals, where either Marta Kostyuk or Wimbledon champion Linda Noskova would be her opponent.
They've just got their fourth-round match under way on Louis Armstrong Stadium and sixth seed Noskova has broken Kostyuk's serve in the opening game.
Sabalenka 6-4 3-3 Townsend*
Taylor Townsend badly miscues a forehand to go 0-30 down on serve. More encouragement from the home crowd.
A double fault follows... three more break points for Aryna Sabalenka and a chance to take a real grip of this match.
Image source, Getty ImagesSabalenka 6-4 3-3 Townsend*
At 30-30 on Aryna Sabalenka's serve, the world number one finds a great serve out wide which Taylor Townsend can't get back, and the American is unable to get the next one over the net as well.
All square.
*Sabalenka 6-4 2-3 Townsend
A double fault to end by Taylor Townsend, a break to love for Aryna Sabalenka.
Back on serve in set two.
Image source, Getty ImagesSabalenka 6-4 1-3 Townsend*
Aryna Sabalenka steps up the pace and has three chances to break back straight away.
Sabalenka 6-4 1-3 Townsend*
Image source, ReutersThere's the break!
Taylor Townsend gets a look at a second serve and finds the baseline with her return to move 3-1 up in set two.
*Sabalenka 6-4 1-2 Townsend
Aryna Sabalenka nets a backhand and falls 0-30 down - chance for Taylor Townsend?
The reigning champion takes the next two points but then nets a forehand, so she'll face the first break point of the second set...
*Sabalenka 6-4 1-2 Townsend
For the second time in the match, there's a swing and a miss by Aryna Sabalenka as she tries to return serve.
Another ace straight afterwards wraps up a love hold for Taylor Townsend.
Patten/Heliovaara 7-5 6-2 Arnaldi/Struff
Image source, Getty ImagesThe top seeds march on!
Briton Henry Patten and Finland's Harri Heliovaara have made it back-to-back straight-set wins at the start of their latest bid for a first US Open title together.
After taking the first set with a late break of serve against Italy's Matteo Arnaldi and German Jan-Lennard Struff, they dominated the second to secure smooth progress.
The Wimbledon champions move on to face either American duo Nathaniel Lammons and Jackson Withrow or James Tracy and Portugal's Francisco Cabral.
Sabalenka 6-4 1-1 Townsend*
An assured hold of serve from Aryna Sabalenka, who levels at 1-1 in the second set.
After seven breaks of serve in 10 games during the opening set, normal service appears to have been resumed.
Just one of the nine points in this set so far have been won by the returning player.
Image source, Reuters
