The Australian government canceled Novak Djokovic's visa for a second time on Friday, saying the world's top-ranked tennis star, who is unvaccinated against COVID-19, may pose a risk to the community.

The decision raises the prospect of a second court battle by the Serbian tennis star to be allowed to remain in the country and bid for a record 21st Grand Slam title at the Australian Open, but time is running out with the tournament starting Monday.

Australian Immigration Minister Alex Hawke exercised his discretionary powers to revoke Djokovic's visa after a court quashed an earlier revocation and released him from immigration detention on Monday.