Naomi Osaka in superb form to beat third seed Coco Gauff 6-3 6-2 and reach first Grand Slam quarter-final since 2021
Wimbledon champion Iga Swiatek beats 13th seed Ekaterina Alexandrova 6-3 6-1 on Louis Armstrong Stadium
Felix Auger-Aliassime beats Andrey Rublev 7-5 6-3 6-4 to reach last eight
Alex de Minaur beats qualifier Leandro Riedi 6-3 6-2 6-1 to book quarter-final tie with Auger-Aliassime
Defending men's champion Jannik Sinner plays Alexander Bublik in night session
Riedi 3-6 0-5 De Minaur*
Wow. This has been pretty brutal for Switzerland's Leandro Riedi.
In rapid quick time - 23 minutes to be exact - he is down a triple break with Alex de Minaur serving for the set.
*Auger-Aliassime 1-3 Rublev
It's an emphatic start from Andrey Rublev.
The Russian holds to 30, brushing off a double fault along the way.
Other than that his serving has been too much for Felix Auger-Aliassime to handle so far.
Image source, Getty ImagesAuger-Aliassime 1-2 Rublev*
Andrey Rublev gets the early break!
The Russian's high-risk strategy pays off, with the 15th seed sending a crashing return back at 30-30 to earn a break point.
Felix Auger-Aliassime then gives Rublev the break by hitting a forehand long.
Image source, Getty Images*Auger-Aliassime 1-1 Rublev
Big opportunity for the Russian..
Riedi 3-6 0-3 De Minaur*
We're 13 minutes into set two and Alex de Minaur is already a double break up.
Impressive stuff from the Australian, who is being watched by fiance - the British number two - Katie Boulter.
Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra and BBC Sounds
Felix Auger-Aliassime is striking the ball big this tournament.
His serve has been operating at a +1.
His numbers have been really strong.
Image source, Getty Images*Auger-Aliassime 1-1 Rublev
A bit of a missed opportunity for Felix Auger-Aliassime.
The Canadian goes 0-15 up but overhits consecutive forehands to let Andrey Rublev off the hook.
The Russian then wins a crucial point at 30-30 after a long rally, before seeing out the hold.
Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra and BBC Sounds
One of the big positives in this matchup for Andrey Rublev is his record against Felix Auger-Aliassime.
It's so bright, and it must give him a boost in confidence - not expectation, but confidence in this encounter.
Stojsavljevic 6-2 Larraya Guidi
In the girl's singles competition, Britain's Mika Stojsavljevic has just won the first set of her first-round match against Sol Ailin Larraya Guidi of Argentina 6-2.
16-year-old Stojsavljevic is the ninth seed and, as the reigning champion, she is expected to go well again in the competition. One to keep an eye on.
Image source, Getty ImagesAuger-Aliassime 1-0 Rublev*
Felix Auger-Aliassime gets off to the perfect start, holding to 30.
Abigail Johnson
Commentator on BBC Radio 5 Sports Extra and BBC Sounds
The head-to-head is very heavy to Andrey Rublev.
But Felix Auger-Aliassime can hang on to the fact six of their eight meetings have gone the distance.
It's just about what he can do to get through those big moments.
*Auger-Aliassime 0-0 Rublev
It's Felix Auger-Aliassime to serve first.
Andrey Rublev has had the upper hand in the head-to-head against Auger-Aliassime, winning seven of their previous eight matches.
But the 25th seed, who made the semi-finals of the US Open in 2021, showed what he can do against Alexander Zverev in the last round.
So, who have you got?
Thumbs up for Zverev, thumbs down for Auger-Aliassime.
Riedi 6-3 De Minaur
So far, so good for Australian eighth seed Alex de Minaur, who has just taken the first set against Switzerland's Leandro Riedi in comfortable fashion.
Riedi had to save break points in his opening service game but could not do the same in his next two as De Minaur secured the double break.
A long forehand from Riedi hands over the first set to De Minaur.
The pair's arrival on court just got announced at the Arthur Ashe Stadium but the arena is far from full at this moment.
Image source, Getty ImagesRublev v Auger-Aliassime
Image source, Getty ImagesFirst up at Arthur Ashe Stadium today is a men's last-16 match between Andrey Rublev and Felix Auger-Aliassime.
Rublev narrowly avoided a major upset in the third round, as he defeated Hong Kong qualifier Coleman Wong 2-6 6-4 6-3 4-6 6-3 in a thrilling match that tested both his physical and mental strength.
25th seed Auger-Aliassime then caused a shock of his own, coming from behind to beat world number three Alexander Zverev 4-6 7-6 (9-7) 6-4 6-4 in a match lasting almost four hours.
Rublev has dominated the head-to-head, winning seven of his eight matches against Canadian Auger-Aliassime.
This one has the potential to be a classic.
There's plenty of doubles action coming up today.
We'll be bringing you updates from the men's second-round match between fourth seeds Kevin Krawietz and Tim Puetz of Germany and American duo Cooper Williams and Theodore Winegar. Krawietz and Puetz were beaten in last year's final.
Later on, women's top seeds Katerina Siniakova and Taylor Townsend - the latter a day on from losing in the women's singles last-16 - take on Camila Osorio and Yue Yuan.
Venus Williams and Leylah Fernandez are also scheduled to play together in the women's doubles later.
BBC Radio 5 Sports Extra
BBC Radio 5 Sports Extra has live commentary of day nine in New York. Coverage is also available via BBC Sounds or by clicking the link at the top of this page.
Image source, Getty ImagesWe'll be kicking off with game-by-game updates from Felix Auger-Aliassime v Andrey Rublev, which is expected to start in the next few minutes.
There will be regular updates from the other early match-up in the men's singles, which sees Leandro Riedi take on Alex de Minaur.
Later in the women's singles, there's the mouth-watering tie between Naomi Osaka and Coco Gauff, as well as Iga Swiatek against Ekaterina Alexandrova.
Welcome back for coverage of day nine of the US Open.
