Bulgaria's Grigor Dimitrov returns the ball during the fourth round match against Uzbekistan's Denis Istomin at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 23, 2017. (Xinhua/Lui Siu Wai)
Bulgaria's Grigor Dimitrov returns the ball during the fourth round match against Uzbekistan's Denis Istomin at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 23, 2017. (Xinhua/Lui Siu Wai)
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