17:05 CET - We are only a few minutes away from the start of the action for the day, with Mirra Andreeva taking on Anastasia Potapova in Louis Armstrong Stadium imminently, and Iga Swiatek facing Qinwen Zheng on Arthur Ashe in about half an hour. The winners of those ties will reach the quarter-finals.
Follow the action on the women's side here!
15:00 CET - Hello and welcome to our coverage of Day 9 at the US Open. We have another huge evening of tennis in store, with the final quarter-final berths set to be sewn up in New York.
Headlining the action on the men's side will be top seed Alexander Zverev, who takes on Luciano Darderi in the late game in Arthur Ashe Stadium.
Before that, we have some epic women's ties to enjoy, with Mirra Andreeva and Iga Swiatek in action early, before Elena Rybakina and Naomi Osaka meet in a blockbuster and Coco Gauff takes on Iva Jovic later on.
Check out the full program below, and get ready for the day ahead with a preview of the headline matches here!
Women's fourth round
Mirra Andreeva vs Anastasia Potapova - 17:00 CET
Iga Swiatek vs Qinwen Zheng - 17:30 CET
Naomi Osaka vs Elena Rybakina - 20:30 CET
Iva Jovic vs Coco Gauff - 01:00 CET
Men's fourth round
Francisco Cerundolo vs Alexander Blockx - 19:00 CET
Karen Khachanov vs Learner Tien - 22:00 CET
