Novak Djokovic, despite facing criticism for his vaccine stance, arrived in Australia and competed in the United Cup, a warm-up to the Australian Open. The World No.1 won the opening singles match against China, 6-3, 6-2, leading Serbia to victory. He then partnered with Olga Danilovic in the mixed doubles, where they defeated Zhang Zhizhen and Zheng Qinwen 6-4, 1-6, 10-6. Following the match, Djokovic led a countdown to the New Year.