Roger Federer of Switzerland attends a training session ahead of 2019 Australian Open at Melbourne Park in Melbourne, Australia, on Jan. 8, 2019. Australian Open Tennis Tournament will take place from Jan. 14 to 27. (Xinhua/Bai Xue)
Roger Federer of Switzerland attends a training session ahead of 2019 Australian Open at Melbourne Park in Melbourne, Australia, on Jan. 8, 2019. Australian Open Tennis Tournament will take place from Jan. 14 to 27. (Xinhua/Bai Xue)
Roger Federer of Switzerland attends a training session ahead of 2019 Australian Open at Melbourne Park in Melbourne, Australia, on Jan. 8, 2019. Australian Open Tennis Tournament will take place from Jan. 14 to 27. (Xinhua/Bai Xue)
Roger Federer of Switzerland attends a training session ahead of 2019 Australian Open at Melbourne Park in Melbourne, Australia, on Jan. 8, 2019. Australian Open Tennis Tournament will take place from Jan. 14 to 27. (Xinhua/Bai Xue)