Professional Record
| 31 Wins (25 knockouts, 6 decisions), 2 Losses (2 knockouts, 0 decisions), 0 Draws, 1 No Contest | |||||||
| Res. | Record | Opponent | Type | Round | Date | Location | Notes |
| Loss | 31–2 |
Ricky Hatton | RTD | 11 (12) | 2005-06-04 | M.E.N. Arena, Manchester, United Kingdom | Lost IBF & The Ring Light Welterweight title. |
| Win | 31–1 |
Sharmba Mitchell | TKO | 3 (12) | 2004-11-06 | Glendale Arena, Phoenix, Arizona, United States | Retained IBF & The Ring Light Welterweight title. |
| Win | 30–1 |
Jesse James Leija | TKO | 6 (12) | 2003-01-19 | Telstra Dome, Melbourne, Victoria, Australia | Retained WBC, WBA (Super), IBF & The Ring Light Welterweight titles. |
| Win | 29–1 |
Ben Tackie | UD | 12 | 2002-05-18 | Mandalay Bay Resort & Casino, Las Vegas, Nevada, United States | Retained WBC, WBA (Super), IBF & The Ring Light Welterweight titles. |
| Win | 28–1 |
Zab Judah | TKO | 2 (12) | 2001-11-03 | MGM Grand, Las Vegas, Nevada, United States | Retained WBC & WBA (Super) & won IBF & vacant The Ring Light Welterweight titles. |
| Win | 27–1 |
Oktay Urkal | UD | 12 | 2001-06-23 | Mohegan Sun Casino, Uncasville, Connecticut, United States | Retained WBC & WBA (Super) Light Welterweight titles. |
| Win | 26–1 |
Sharmba Mitchell | RTD | 7 (12) | 2001-02-03 | Mandalay Bay Resort & Casino, Las Vegas, Nevada, United States | Retained WBC & won WBA (Super) Light Welterweight titles. |
| Win | 25–1 |
Julio César Chávez | TKO | 6 (12) | 2000-07-29 | Veteran's Memorial Coliseum, Phoenix, Arizona, United States | Retained WBC Light Welterweight title. |
| Win | 24–1 |
Ahmed Santos | TKO | 8 (12) | 2000-02-12 | Mohegan Sun Casino, Uncasville, Connecticut, United States | Retained WBC Light Welterweight title. |
| Win | 23–1 |
Miguel Angel Gonzalez | TKO | 10 (12) | 1999-08-21 | Miccosukee Indian Gaming Resort, Miami, Florida, United States | Won vacant WBC Light Welterweight title. |
| Win | 22–1 |
Diosbelys Hurtado | TKO | 5 (12) | 1998-11-28 | Fantasy Springs Casino, Indio, California, United States | Won interim WBC Light Welterweight title. |
| Win | 21–1 |
Rafael Ruelas | TKO | 9 (12) | 1998-08-15 | County Coliseum, El Paso, Texas, United States | WBC Light Welterweight Title Eliminator. |
| Win | 20–1 |
Calvin Grove | KO | 1 (10) | 1998-04-05 | Newcastle Entertainment Centre, Newcastle, New South Wales, Australia | |
| Win | 19–1 |
Ismael Armando Chaves | TKO | 3 (12) | 1997-12-06 | Newcastle Entertainment Centre, Newcastle, New South Wales, Australia | WBC Light Welterweight Title Eliminator. |
| Loss | 18–1 |
Vince Phillips | TKO | 10 (12) | 1997-05-31 | Trump Taj Mahal, Atlantic City, New Jersey, United States | Lost IBF Light Welterweight title. |
| NC | 18–0 |
Leonardo Mas | NC | 1 (12) | 1997-01-18 | Thomas & Mack Center, Las Vegas, Nevada, United States | Retained IBF Light Welterweight title. |
| Win | 18–0 | Jan Piet Bergman | KO | 6 (12) | 1996-09-14 | Entertainment Centre, Newcastle, New South Wales, Australia | Retained IBF Light Welterweight title. |
| Win | 17–0 | Corey Johnson | KO | 4 (12) | 1996-05-24 | Sydney Entertainment Centre, Sydney, New South Wales, Australia | Retained IBF Light Welterweight title. |
| Win | 16–0 | Hugo Pineda | TKO | 11 (12) | 1996-01-20 | Parramatta Stadium, Sydney, New South Wales, Australia | Retained IBF Light Welterweight title. |
| Win | 15–0 | Roger Mayweather | UD | 12 | 1995-06-25 | Newcastle Entertainment Centre, Newcastle, New South Wales, Australia | Retained IBF Light Welterweight title. |
| Win | 14–0 | Jake Rodriguez | TKO | 6 (12) | 1995-01-28 | MGM Grand, Las Vegas, Nevada, United States | Won IBF Light Welterweight titles |
| Win | 13–0 | Pedro Sanchez | TKO | 4 (10) | 1994-08-29 | National Tennis Centre, Melbourne, Victoria, Australia | |
| Win | 12–0 | Angel Hernandez | TKO | 7 (10) | 1994-05-02 | Newcastle, New South Wales, Australia | |
| Win | 11–0 | Hector Lopez | UD | 10 | 1994-01-11 | Hyatt Regency, Tampa, Florida, United States | |
| Win | 10–0 | Livingstone Bramble | UD | 10 | 1993-08-23 | Newcastle, New South Wales, Australia | |
| Win | 9–0 | Robert Rivera | KO | 1 (10) | 1993-06-18 | Newcastle, New South Wales, Australia | |
| Win | 8–0 | Larry LaCoursiere | TKO | 1 (10) | 1993-05-14 | Newcastle, New South Wales, Australia | |
| Win | 7–0 | Steve Larrimore | TKO | 2 (10) | 1993-01-30 | The Pyramid, Memphis, Tennessee, United States | |
| Win | 6–0 | Sammy Fuentes | TKO | 1 (10) | 1992-11-13 | Festival Hall, Melbourne, Victoria, Australia | |
| Win | 5–0 | Daniel Ricardo Cusato | TKO | 7 (10) | 1992-09-11 | Sydney, New South Wales, Australia | |
| Win | 4–0 | Juan La Porte | UD | 10 | 1992-07-23 | Darling Harbour Convention Centre, Sydney, New South Wales, Australia | |
| Win | 3–0 | Tony Jones | TKO | 2 (10) | 1992-05-07 | Darling Harbour Convention Centre, Sydney, New South Wales, Australia | |
| Win | 2–0 | Nedrick Simmons | KO | 1 (8) | 1992-04-02 | Sydney, New South Wales, Australia | |
| Win | 1–0 | Darrell Hiles | TKO | 1 (8) | 1992-03-01 | Princes Park Football Ground, Melbourne, Victoria, Australia | Kostya's professional debut. |
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