Former world number one Andy Murray has been handed a place in the main draw of the US Open after Stanislas Wawrinka pulled out.
Murray, the 2012 champion at Flushing Meadows, reached the second round of the event last year, which was won by Dominic Thiem.
The 34-year-old, who competed in the men's doubles at the Tokyo Olympics, has only played eight Tour-level matches in 2021. He was handed a wildcard for Wimbledon, where he lost in the third round to Denis Shapovalov.
Novak Djokovic is due to lead a strong men's field for the tournament in August, which will be played in front of capacity crowds.
The world number one is seeking to become the first man to win all four major championships in the same year since Rod Laver in 1969.
Rafael Nadal and Roger Federer, who are tied with Djokovic on 20 grand slam singles titles, are also set to play.
Wawrinka, himself a champion in New York in 2016, is still recovering from his second foot surgery of the year.