With a career lasting 13 years, southpaw Kostya Tszyu started off his career at age 22 on March 1992, last fighting in 0 and building a record of 31-2-0. Tszyu in his 34 fights. Tszyu's longest win streak is 18 fights between March 1992 and September 1996. His longest KO streak in his 34 fights is 8 fights long.
Tszyu's first fight came against Darrell Hiles where Tszyu became only the 2nd person to stop Hiles, stopping him in round 1 to claim his first pro fight stoppage and an almost perfect start to his career. Following his debut, Tszyu had an impressive start to his career as he went on to win his next 17 fights including 6 times in 1992, 4 times in 1993 and 7 times through 1994, 1995 and 1996 against the likes of Roger Mayweather, Hugo Pineda and Angel Hernandez.
Jan piet Bergman was beaten next on September 14th, 1996 meaning Tszyu could maintain his unbeaten streak. Becoming the first person to stop Jan piet Bergman, Tszyu beat Bergman via KO in the 6th round of a 12 round fight.
Tszyu went into his next fight against Vince Phillips on May 31st, 1997 with a career record of 18-1-0. Vince Phillips became the first person to stop Tszyu. The win came via TKO in the 10th round of a 12 round bout.
On December 6th, 1997, Tszyu was in action again with a win via TKO against Ismael armando Chaves taking his mostly successful record to 19-1-0. Tszyu's fight against Ismael armando Chaves came in the 3rd round of a 12 round fight via TKO. Tszyu became the first person to stop Chaves. Tszyu then went on to win a further 3 fights taking his record to 22 wins, 1 losses and 0 draws.
Tszyu kept his losses at 1 by beating Miguel angel Gonzalez on August 21st, 1999. Becoming the first person to stop Miguel angel Gonzalez, Tszyu beat Gonzalez via TKO in the 10th round of a 12 round fight. 6 wins followed where Tszyu went on to be the first to stop Ahmed Santos, first to stop Zab Judah and 3rd person to stop Julio cesar Chavez (Round 6 TKO).
Tszyu kept his losses at 1 by beating Jesse james Leija on January 19th, 2003. Leija was stopped in the 6th round via RTD meaning Tszyu was the 4th person to stop this opponent.
The next defeat of Tszyu's career came against Ricky Hatton on June 4th, 2005. This took his career record to 31-2-0. This turned out to be Tszyu's final career fight. Hatton became the 2nd person to stop Tszyu in round 11 of a 12 round fight via RTD.