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Chung Hyeon of hits a return during the men's singles third round match against 's Alexander Zverev at Australian Open 2018 in Melbourne, Australia, Jan. 20, 2018. Chung Hyeon won 3-2. (Xinhua/Li Peng)
 
 
Chung Hyeon of hits a return during the men's singles third round match against 's Alexander Zverev at Australian Open 2018 in Melbourne, Australia, Jan. 20, 2018. Chung Hyeon won 3-2. (Xinhua/Li Peng)