
Grigor Dimitrov of Bulgaria celebrates after men's single's first round match against Janko Tipsarevic of Serbia at the 2019 Australian Open in Melbourne, Australia, Jan. 14, 2019. Grigor Dimitrov won 3-1. (Xinhua/Hu Jingchen)

Grigor Dimitrov of Bulgaria celebrates after men's single's first round match against Janko Tipsarevic of Serbia at the 2019 Australian Open in Melbourne, Australia, Jan. 14, 2019. Grigor Dimitrov won 3-1. (Xinhua/Hu Jingchen)