Novak Djokovic, the No. 1 tennis star in the world, was denied entry into Australia on Thursday after initially being granted a medical exemption for the country’s COVID-19 vaccination requirements so that he could play in the Australian Open.

The tennis star, left stranded at Melbourne’s Tullamanrien airport overnight, was issued a letter by the Australian government saying his visa had been denied and he would be deported, a source close to the tournament said.

The tennis star was filing an injunction to prevent his deportation, the source said.