Full name
Konstantin Borisovich Tszyu

Birthdate
September 19, 1969

Debut
On March 1, 1992, in Melbourne, he knocked out Darrell Hiles in one round.

won the world title
On January 28, 1995, in Las Vegas, he defeated Jake Rodríguez by technical knockout in six rounds and obtained the super lightweight title of the International Boxing Federation. His second title, the WBC interim super lightweight, was obtained on November 28, 1998 in Indio, California, by knocking out Diosbelys Hurtado in five rounds. On August 21, 1999, in Miami, he obtained the vacant WBC super lightweight title by defeating Mexican Miguel Ángel González by technical knockout in ten rounds. On February 3, 2001, he beat Sharmba Mitchell in the WBA super lightweight by winning a seven-round medical technical decision. In addition, on November 3, 2001, in Las Vegas, he knocked out Zab Judah in two rounds and took the IBF super lightweight title from him to hold three titles in the same division and at the same time.

Lost His Title
The first time was in his sixth defense on May 31, 1997, in Atlantic City, Vince Phillips knocked him out in ten rounds. In his second stage as monarch and only of the IBF, since he had resigned from the WBC and the WBA, he lost it to Ricky Hatton, on June 4, 2005 in London, when he fell in eleven rounds.

Withdrawal
On June 4, 2005, after the loss with Ricky Hatton