American twins Bob and Mike Bryan - the most successful men's doubles team of all time - have announced their immediate retirement.
The brothers, 42, previously announced their intention to retire following the 2020 US Open, but have bowed out early because there will be no fans at Flushing Meadows.
They won a record 119 tournaments, including 16 Grand Slam titles.
"The crowds is what make the US Open magical in our minds," Bob Bryan said.
"It was to really say our thank-yous to everybody and feel the atmosphere one last time."
His brother Mike added during an interview with the New York Times.