05:30 CET - Marketa Vondrousova upsets 9th seed Elena Rybakina 6-4, 5-7, 6-2 after serving 13 aces. She now advances to her second-ever US Open quarter-finals after claiming her 16th top-10 win.
03:45 CET - Aryna Sabalenka takes down Cristina Bucsa 6-1, 6-4 in just 74 minutes to make her 12th straight Grand Slam quarter-finals. The world's No. 1 continues to dominate.
03:10 CET - Novak Djokovic advances to his 14th US Open quarter-finals after beating Jan-Lennard Struff in straight sets 6-3, 6-3, 6-2. He will now take on the American Taylor Fritz in the next round.
02:00 CET - World's No. 4 Taylor Fritz advances to the US Open quarter-finals for the third straight year after defeating Tomas Machac in straight sets 6-4, 6-3, 6-3.
23:54 CET - For the first time since 2021, Barbora Krejcikova is into the US Open quarter-finals! After surviving by the skin of her teeth in a remarkable end to the second set, the two-time Grand Slam champion kicked on to beat Taylor Townsend 1-6, 7-6 (13), 6-3.
In the world number 61's quest to get back to the top, this could one day be looked back on as a huge night.
22:56 CET - In absolutely incredible drama, Barbora Krejcikova has saved seven match points against Taylor Townsend on her way to winning a second-set tiebreak 15-13 and taking things into a decider!
21:55 CET - World number two Carlos Alcaraz continues his run in New York, seeing off Arthur Rinderknech in straight sets 7-6(3), 6-3, 6-4.
20:33 CET - A big win for Jiri Lehecka at the US Open as he downs French veteran Adrian Mannarino in four sets 7-6(4), 6-4, 2-6, 6-2 to make it into the next round.
18:42 CET - Fourth seed Jessica Pegula is the first winner of the evening, with the American beating compatriot Ann Li 6-1, 6-2 in under an hour to become the first quarter-finalist of the year in style.
17:19 CET - Play is now underway in New York, as Adrian Mannarino and Jiri Lehecka battle it out for a spot in the quarter-finals.
Follow that match with Flashscore here.
15:00 CET - Hello and welcome to our coverage of today's fourth-round action at the US Open!
Play gets started in just over a couple of hours, with Jiri Lehecka taking on experienced Frenchman Adrian Mannarino and women's fourth seed Jessica Pegula facing fellow American Ann Li.
Later on, top seed and defending champion Aryna Sabalenka comes up against Cristina Bucsa, while Carlos Alcaraz, Novak Djokovic and Taylor Fritz all look to move into the last eight on the men's side of the tournament.
Keep track of the full men's draw here and the full women's draw here.