Roger Federer of Switzerland serves during the men's semifinal match against Chung Hyeon of South Korea at Australian Open 2018 in Melbourne, Australia, Jan. 26, 2018. (Xinhua/Bai Xuefei)
Australian Open: Chung Hyeon retires from match due to injury
Source: Xinhua| 2018-01-26 19:23:05|Editor: ZD
