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Grigor Dimitrov of Bulgaria serves during the men's singles fourth round match against Nick Kyrgios of Australia at Australian Open 2018 in Melbourne, Australia, Jan. 21, 2018. (Xinhua/Bai Xuefei)

Grigor Dimitrov of Bulgaria serves during the men's singles fourth round match against Nick Kyrgios of Australia at Australian Open 2018 in Melbourne, Australia, Jan. 21, 2018. (Xinhua/Bai Xuefei)