Here is a list of Tszyu's best fights. For a list of Tszyu's losses, refer to "Kostya Tszyu Losses".
On June 25, 1995 Kostya Tszyu met Roger Mayweather in a super-lightweight (IBF) world-title defense fight. Tszyu was 25 years old and with a record of 15-0 (11), and Mayweather was 34 years old and with a record of 54-11 (32). Tszyu won the fight via 12-round unanimous decision and successfully defended his title.
On July 23, 1992 Kostya Tszyu faced off against Juan Laporte at age 22. He was coming in with a record of 4-0 (3), and Laporte was 32 years old and with a record of 37-11-1 (19). Tszyu won the fight via 10-round unanimous decision.
On June 23, 2001 Kostya Tszyu met Oktay Urkal in a super-lightweight (WBA (Super) and WBC) world-title defense fight. Tszyu was 31 years old and with a record of 27-1 (22), and Urkal was 31 years old and with a record of 28-0 (10). Tszyu won the fight via 12-round unanimous decision and successfully defended his titles.
On August 23, 1993 Kostya Tszyu faced off against Livingstone Bramble at age 23. He was coming in with a record of 10-0 (8), and Bramble was 32 years old and with a record of 34-11-3 (22). Tszyu won the fight via 10-round unanimous decision.
On May 18, 2002 Kostya Tszyu met Ben Tackie in a super-lightweight (WBA (Super), WBC, IBF and The Ring) world-title defense fight. Tszyu was 32 years old and with a record of 29-1 (23), and Tackie was 28 years old and with a record of 24-2 (15). Tszyu won the fight via 12-round unanimous decision and successfully defended his titles.
On August 15, 1998 Kostya Tszyu faced off against Rafael Ruelas at age 28. He was coming in with a record of 21-1 (17), and Ruelas was 27 years old and with a record of 52-3 (41). Tszyu stopped Rafael Ruelas via TKO.
On July 29, 2000 Kostya Tszyu met Julio César Chávez in a super-lightweight (WBC) world-title defense fight. Tszyu was 30 years old and with a record of 25-1 (21), and Chávez was 38 years old and with a record of 103-4-2 (84). Tszyu stopped Julio César Chávez via 6th-round TKO and successfully defended his title.
On November 3, 2001 Kostya Tszyu, the WBA (Super) and WBC champion, met Zab Judah, the IBF and The Ring champion, in a super-lightweight world-title unification fight. Tszyu was 32 years old and with a record of 28-1 (23), and Judah was 24 years old and with a record of 27-0 (21). Tszyu stopped Zab Judah via 2nd-round TKO and is crowned the unified WBA (Super), WBC, IBF and The Ring champion.
On August 21, 1999 Kostya Tszyu fought Miguel Angel Gonzalez in a super-lightweight world-title fight for the WBC title. Tszyu was 29 years old and with a record of 23-1 (19), and Gonzalez was 28 years old and with a record of 43-1-1 (33). Tszyu stopped Miguel Angel Gonzalez via 10th-round TKO and is crowned the new super-lightweight world champion.
On January 19, 2003 Kostya Tszyu met Jesse James Leija in a super-lightweight (WBA (Super), WBC, IBF and The Ring) world-title defense fight. Tszyu was 33 years old and with a record of 30-1 (24), and Leija was 36 years old and with a record of 43-5-2 (17). Tszyu stopped Jesse James Leija via 6th-round retirement and successfully defended his titles.