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Gael Monfils of France reacts during the ATP Cup Group A match against Novak Djokovic of Serbia in Brisbane, Australia, on Jan. 6, 2020. (Xinhua/Bai Xuefei)

Gael Monfils of France reacts during the ATP Cup Group A match against Novak Djokovic of Serbia in Brisbane, Australia, on Jan. 6, 2020. (Xinhua/Bai Xuefei)