Britons Johanna Konta and Dan Evans will play their US Open second-round matches on Thursday after Wednesday's matches on the uncovered outside courts were cancelled because of rain.
British number one Konta and opponent Margarita Gasparyan were due to kick off the day's play on Grandstand.
The pair finally came out on to court just before 22:30 BST to begin their warm-up before the rain started again.
British men's number two Evans will play world number 27 Lucas Pouille.
All the day matches on the covered Arthur Ashe Stadium and Louis Armstrong Stadium were completed.