Australia revoked the visa of tennis star Novak Djokovic on Friday for the second time, the latest development in controversy over the entry of the men's world No. 1, who has not been vaccinated for COVID-19.Immigration Minister Alex Hawke said Djokovic's visa was rescinded "on health and good order grounds, on the basis that it was in the public interest to do so," pointing to Canberra's commitment to protecting Australia's borders during the coronavirus pandemic.Prime Minister Scott Morrison backed the decision, stressing the country's strong border protection policies.Related coverage:READ FULL ARTICLE