Konstantin Borisovich "Kostya" Tszyu is a retired Russian-Australian professional boxer of mixed Russian, Korean and Mongol descent. His Russian-Korean name may appear cumbersome in English, though it is pronounced the same as the traditional anglophone spelling of the Christian first name and Korean surname: Constantine Tsu. His spelling is an overly literal legal letter-for-letter transcription of his native Cyrillic alphabet documents as issued by the Soviet Union, presumably retained because his international career began before his move to Australia. "Kostya" is simply the traditional short, informal Russian version of his first name. 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. He is considered by many in Australia to be a national sports hero. In Ring Magazine's March 2010 issue, Tszyu was ranked as the number one junior welterweight of the decade. On 7 December 2010, he was inducted into the International Boxing Hall of Fame for the Class of 2011. 

September 19th, 1969 in Serov (Age 54)