World number one Novak Djokovic has withdrawn from this week’s Indian Wells Masters event with the Serb unable to enter the United States.
The 22-time Grand Slam winner, 35, had applied for special permission to enter the US because he is not vaccinated against Covid-19.
The US requires international visitors to be vaccinated and proof will be required until at least 10 April.
Indian Wells – one of the most prestigious tournaments on the tennis calendar outside of the Grand Slams – starts on 6 March.
On Friday the United States Tennis Association and the US Open said they were “hopeful” Djokovic would be allowed to play this month’s Indian Wells and Miami Masters 1,000 events.