Novak Djokovic is unlikely to play at the US Open after organisers said they would "respect" American government rules over travel for unvaccinated players.
Djokovic is not vaccinated and missed the Australian Open earlier this year for that reason.
The 35-year-old Serb won the Wimbledon title in July and said that he would "wait hopefully for some good news".
The tournament in New York takes place from 29 August to 11 September.
Three-time US Open champion Djokovic has been named on the entry list for the final Grand Slam of the year but that is routine, rather than an indication that he will be allowed to play.