Rain rips through US Open night session, delaying action even under Armstrong roof

WATCH: Former champion Sloane Stephens took out fellow American Coco Gauff before the storm gained intensity.

Wild weather wreaked havoc as play wrapped up on the third day of the US Open, with competition suspended even indoors under the roof at Louis Armstrong Stadium when severe wind and rain hit the grounds of Flushing Meadows.

The second-round meeting between Argentine Diego Schwartzman and South Africa's Kevin Anderson was forced to move to Ashe, finishing at around 1 a.m. just as a travel ban was issued through 5 a.m. for New York.

There was a flash flood warning for the area, and most subway lines and roads in the city were shut down as the fierce storm, caused by Hurricane Ida, battered New York.

Spectators and personnel still on the grounds were stranded. Still, there was tennis to watch deep into the night as Schwartzman and Anderson returned to finish their encounter. The second singles scheduled for Armstrong, featuring Angelique Kerber, was cancelled for the day.

Though the roof had been shut on Armstrong, the court's unique 'natural ventilation system' allowed rain to blow in from the upper portion of the stadium. Play was stopped and the court dried during the first set, but Schwartzman slipped on the run in the tiebreak and Anderson left the court during the second set as conditions became increasingly wet.

The players returned around midnight on Ashe, where the night session was completed despite some rain also coming in through the roof. Finally Schwartzman, who won in straight sets, went on to complete a memorable victory.

"It's tough to walk on court at 12 [a.m.], but wanted to finish," he told ESPN courtside. "I was trying to push to play, and finally I played great, so it's a nice story, here in New York."

All other singles play was completed on schedule.