Bulgaria's Grigor Dimitrov celebrates after the fourth round match against Uzbekistan's Denis Istomin at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 23, 2017. (Xinhua/Zhu Hongye)
Bulgaria's Grigor Dimitrov celebrates after the fourth round match against Uzbekistan's Denis Istomin at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 23, 2017. (Xinhua/Zhu Hongye)
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