Novak Djokovic's participation in this year's Australian Open is in jeopardy once again ... officials have canceled his visa for a second time, and he's now facing deportation.
Australian Immigration Minister Alex Hawke made the ruling early Friday morning ... revoking the 34-year-old's visa just days after a judge had allowed the tennis star to go free in the country.
In announcing his decision, Hawke explained pulling Djokovic was in the best for "public interest" ... due to the athlete's COVID-19 vaccination status and controversial claims to a vaccine exemption.