Konstantin Borisovich ‘Kostya’ Tszyu is a Russian-Australian professional boxer who is a two-time world light-welterweight Championship. As a professional boxer, he competed from 1992 to 2005. Regarded as one of the hardest-hitting light-welterweights, he relied heavily on accuracy and timing, and had daunting punching power. He won a bronze medal in the lightweight division at the 1989 World Championships and a gold in the light-welterweight division at the 1991 World Championships. He also won gold medals at the 1989 and 1991 European Championships. His biography ‘Kostya: My Story’, released in 2005, narrates his story of a child who turned to boxing to protect himself in the harsh environment of Siberia, and went on to become a world champion. Kostya, who has not yet retired from boxing officially, fought his last match in 2005, which he lost. In his career, he has won 31 out of 34 fights—25 of them with a knockout. He is the first champion to unify all the belts the light welterweight division in over 30 years. Ranked as the number one junior welterweight of the decade (2000s) by Ring Magazine, he was inducted into the International Boxing Hall of Fame in December 2010.