Novak Djokovic has been detained in Australia ahead of a court hearing that will determine whether the tennis star can stay in the country unvaccinated.
The Serbian faces deportation after his visa was cancelled for a second time, with the government labelling the 34-year-old a threat to the public.
His lawyers are appealing against what they called an "irrational" judgement, with the hearing set for Sunday.
Djokovic is still scheduled to play the Australian Open on Monday in Melbourne.
If he were to win the tournament for a 10th time, he would become the most successful men's tennis player in the history of the sport with 21 Grand Slam titles.