Novak Djokovic had received a medical exemption to compete in the Australian Open without being vaccinated against COVID-19, but that same medical exemption could end up preventing him from entering the country. Djokovic has reportedly been denied entry to Australia due to a visa mixup. According to the Times of London, a member of Djokovic's team applied for the wrong class of visa — one that doesn't apply to people who have gotten a medical exemption — and Djokovic's stuck at the airport without a way to enter the country. VIA THE TIMES But Djokovic is presently unable to proceed...