Tags: Boxer.
Konstantin Borisovich Kostya Tszyu (/ˈkɒstə ˈzuː/; Russian: Константин (Костя) Борисович Цзю; born 19 September 1969) is a semi-retired Russian-Australian professional boxer of mixed Russian Korean and Mongol descent. He holds both Russian and Australian citizenship and is a four-time world Light Welterweight Champion including a period of time as the Undisputed Light Welterweight Champion.Tszyu was the first champion to unify the light welterweight division in over 30 years.