Konstantin Borisovich "Kostya" Tszyu is a Soviet-born Australian former professional boxer who a child, Kostya was hyperactive, so his father decided to take him to a boxing gym, where he would channel that energy by fighting older.status, inactive. birth name, Konstantin Borisovich Tszyu. alias, Thunder from Down Under. born, 1969-09-19. nationality. Australia. debut, 1992-03-01. division .Kostya Tszyu est un boxeur russe naturalisé australien né le 19 septembre 1969 à Serov. Sommaire. 1 Carrière; 2 Distinction; 3 Références; 4 Liens externes .