WBO (World Boxing Organization) Champion Ukrainian boxer Oleksandr Usyk celebrates after defeating WBC (World Boxing Council) Champion Latvian boxer Mairis Briedis during the World Boxing Super Series cruiserweight division semi-final at the Arena Riga in Riga, Latvia, on Jan. 27, 2018. Oleksandr Usyk was crowned unified cruiserweight world champion by edging out Mairis Briedis on points in semifinal on Saturday. (Xinhua/Janis)