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Nick Kyrgios (C) of Australia celebrates with his teammates after winning the ATP Cup Group F match against Jan-Lennard Struff of Germany in Brisbane, Australia, on Jan. 3, 2020. (Xinhua/Bai Xuefei)

Nick Kyrgios (C) of Australia celebrates with his teammates after winning the ATP Cup Group F match against Jan-Lennard Struff of Germany in Brisbane, Australia, on Jan. 3, 2020. (Xinhua/Bai Xuefei)