Viktor Troicki of Serbia hits the ball during the men's singles third round match against Stan Wawrinka of Switzerland at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 20, 2017. Troicki lost 1-3. (Xinhua/Bai Xue)
Viktor Troicki of Serbia hits the ball during the men's singles third round match against Stan Wawrinka of Switzerland at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 20, 2017. Troicki lost 1-3. (Xinhua/Bai Xue)