04:25 CET - Amanda Anisimova plays an excellent match to end the day, defeating Beatriz Haddad Maia 6-0, 6-3. She has reached consecutive major quarter-finals for the first time, having reached the final at Wimbledon.
02:40 CET - It was a no-nonsense showing from Jannik Sinner as the world number one eased past Alexander Bublik 6-1, 6-1, 6-1 to continue his quest to defend the US Open title.
00:50 CET - The number two pair Jasmine Paolini and Sara Errani stave off the challenge of Fanny Stollar and Hsien Wu Feng 6-1, 2-6, 6-3 to make the quarter-finals in doubles action.
00:35 CET - Venus Williams and Leylah Fernandez book their place in the US Open Doubles quarter-finals after getting the better of the 12 seeds Ekaterina Alexandrova and Zhang Shuai 6-3, 6-4.
22:28 CET - Karolina Muchova has beaten Marta Kostyuk 6-3, 6-7, 6-3 to set up a quarter-final meeting with the red-hot Naomi Osaka.
The 11th-seeded Czech was pushed by her Ukrainian opponent, but won the fourth-round encounter after almost three hours on court.
22:17 CET - Lorenzo Musetti is the next man to book a spot in the quarter-finals in New York, after the Italian overcame Jaume Munar extremely comfortably, winning 6-3, 6-0, 6-1 in just over 90 minutes.
Next up for Musetti is a meeting with the winner of the late men's match, the final fourth-round fixture, between world number one Jannik Sinner and Alexander Bublik.
You can follow Sinner vs Bublik live here from 01:00 CET.
21:32 CET - Naomi Osaka has beaten Coco Gauff 6-3, 6-2 to dump the third seed out of her home Grand Slam in ominous fashion.
The Japanese two-time former US Open winner is in red-hot form, and she saved her best for today in New York, losing just five games and needing only a touch over an hour to book a quarter-final berth.
Watch out, Flushing Meadows, she's back!
20:18 CET - Women's second seed Iga Swiatek has cruised into the quarter-finals in New York by downing Ekaterina Alexandrova 6-3, 6-1.
The Pole was at her ruthless best, sending the world number 12 tumbling out in a little over an hour.
20:01 CET - What a return to form it has been for Felix Auger-Aliassime at the US Open! The Canadian, who has been struggling for such a while, put in another imperious and aggressive performance to brush aside Andrey Rublev in two hours and a quarter, 7-5, 6-3, 6-4.
18:45 CET - Alex de Minaur is the first winner of the day in New York after swatting aside qualifier and world number 435 Leandro Riedi 6-3, 6-2, 6-1 to book his spot in the quarter-finals.
17:09 CET - Play is now underway at the US Open, and you can follow the men's action here, and the women's right here!
15:15 CET - Good afternoon and welcome back to the Tennis Tracker on a superb day of action at Flushing Meadows!
Up first on Arthur Ashe at 17:00 CET is a clash between Felix Auger-Aliassime and Andrey Rublev, and what a chance it is for both players to book their spots in the quarter-finals of a Grand Slam!
That will be followed by the match of the day between heavyweight superstars Coco Gauff and Naomi Osaka. It is a tantalising prospect.
On Louis Armstrong at around the same time, Alex de Minaur will be taking on surprise package Leandro Riedi, before Wimbledon champion Iga Swiatek goes head-to-head with Ekaterina Alexandrova.
In the night session, Jannik Sinner has an extremely tricky test against the enigmatic Alexander Bublik, while home favourite Amanda Anisimova comes up against Beatriz Haddad Maia.
Meanwhile, Lorenzo Musetti meets Jaume Munar, and on Grandstand, Karolina Muchova and Marta Kostyuk face off!