Officials attempted to dry the surface using blowers and towels.
US Open 2021 Venue Flushing Meadows New York Date: 30-08-12 September Coverage: Daily radio commentary on BBC Radio 5 Live Sports Extra/BBC Sport website or app. Also, live text commentaries and match report on the app and website.
Rain can cause play to be suspended. These are not the words you would expect on a court without a roof.
However, at the US Open Louis Armstrong Stadium was filled with bizarre scenes. Fans put up umbrellas and water poured in.
Before being interrupted in the second round match between Diego Schwartzman, the 11th seed of Argentina, and Kevin Anderson of South Africa, the match was suspended in the first set.
Anderson said, before he left the court.
The court was equipped with air-blowers. Umpires and children tried to dry the surface using towels, but the wind continued to blow the rain down the sides of the roof onto the court.
It was a contrast scene at the Arthur Ashe Stadium. Adrian Mannarino and Stefanos Tsitsipas continued to be dry and played their match under the roof.
Updated order of play to indicate that Anderson and Schwartzman would continue on Ashe. However, the match between Angelique Kerber and Anhelina Kalinina at Louis Armstrong Stadium would be moved to Thursday.
New York is currently under a tornado warning. Wednesday's Flushing Meadows match was interrupted by flooding.
After a delay of half an hour, the first set was at 5-5. The tie-break was stopped at 4-4 after both players complained about slippery surfaces.
They returned and Schwartzman won the set. However, play was called off in the second game of the set because Anderson was leading by 30-15 on his serve.
Fans sought shelter under umbrellas at court
After heavy rain, fans left the US Open courts and took shelter under umbrellas.