Video PlayerClose
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)
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)