Each wrestler has been allotted a single room and has to stay there till the completion of the mandatory quarantine period.
Karolina Pliskova, the world number three, is the highest-ranked player and top seed going into the second Grand Slam tournament of the year.
The world number one headlines the opening day of a tennis major that promises to be unlike any other and which is missing several top players due to coronavirus fears.
Three Indian players including Sumit Nagal and Rohan Bopanna have backed the Professional Tennis Players Association.
Djokovic has been drawn on the top line of the men's bracket, sharing the first quarter with No. 6 seed David Goffin, who will play Reilly Opelka in his first-round match.
The Bryans, who collected 16 Grand Slam championships together, already said last year that they would end their career in 2020.
Another player withdrawing from the U.S. Open on Wednesday was Polona Hercog.
Nishikori, 30, was the 2014 US Open runner-up and the first Asian man in a Grand Slam singles finals.
This was Williams’ fifth match since professional tennis resumed amid the coronavirus pandemic after a hiatus of nearly six months — and all five have gone three sets.
The No.1-ranked Djokovic was playing his first ATP match in six months because of the coronavirus pandemic; he pulled out of the doubles event Sunday because of his neck.
She is the latest woman with a Grand Slam title or high ranking to withdraw from the tournament that begins next week amid the coronavirus pandemic.
Murray's first match in nine months as he resumes his climb back from two hip operations came at the first ATP tournament for anyone in five months.
Defending champion Rafael Nadal, top-ranked woman Ashleigh Barty and world number two Simona Halep are among a list of stars opting to skip the event because of concerns about COVID-19.
Some of the cynicism around the restarting of tennis can be attributed to Novak Djokovic's ill-fated Adria Tour after the tennis star got infected with the virus.
It was the first professional tennis event in the United States since the start of the coronavirus outbreak, and no spectators were allowed.