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Novak Djokovic of Serbia reacts during an exihibition match on Kids Tennis Day, held at Melbourne Park in Melbourne, Australia, Jan. 13, 2018. (Xinhua/Bai Xuefei)
Novak Djokovic of Serbia reacts during an exihibition match on Kids Tennis Day, held at Melbourne Park in Melbourne, Australia, Jan. 13, 2018. (Xinhua/Bai Xuefei)