Novak Djokovic, the world No. 1 player in men’s tennis, had a lot at stake going into this year’s Australian Open. A win there would have made him the most decorated male tennis player in history. But he arrived in the country without having had a Covid-19 vaccination, flying in the face of Australia’s rules, and after a court battle he was ultimately deported. In Australia, the “Djokovic affair” has become about a lot more than athletes and vaccines — it has prompted conversations about the country’s aggressive border policy, isolationism and treatment of migrants.