Professional Boxing Record
| 44 Wins (30 Knockouts), 9 Losses, 1 Draw, 1 No Contest | |||||||
| Result | Record | Opponent | Type | Round | Date | Location | Notes |
| Loss | 44-9-1 |
David Haye | TKO | 9 (12) | 04/03/2010 | M.E.N. Arena, Manchester, England, United Kingdom | For WBA Heavyweight title. Ruiz down twice in the 1st, once late in the 5th and once in the 6th. Haye deducted a point in the 1st for hitting the back of Ruiz's head. Ruiz's corner finally threw in the towel in round 9. |
| Win | 44-8-1 |
Adnan Serin | TKO | 7 (10) | 07/11/2009 | Nuremberg Arena, Nuremberg, Bayern, Germany | Serin's corner threw in the towel. |
| Loss | 43-8-1 |
Nikolai Valuev | UD | 12 | 30/08/2008 | Max Schmeling Halle, Prenzlauer Berg, Berlin, Germany | For vacant WBA Heavyweight title. Valuev received a point deduction in 10th round for pushing Ruiz down. Valuev was originally scored a split decision victory but an error later found on the scorecards gave him a unanimous decision. |
| Win | 43-7-1 |
Jameel McCline | UD | 12 | 08/03/2008 | Plaza de Toros, Cancun, Quintana Roo, Mexico | WBA Heavyweight title eliminator. |
| Win | 42-7-1 |
Otis Tisdale | TKO | 2 (10) | 13/10/2007 | Sears Centre, Hoffman Estates, Illinois, United States | Tisdale down twice in the 1st round and once in the 2nd round. |
| Loss | 41-7-1 |
Ruslan Chagaev | SD | 12 | 18/11/2006 | Burg-Waechter Castello, Dusseldorf, North Rhine-Westphalia, Germany | WBC Heavyweight title eliminator. |
| Loss | 41-6-1 |
Nikolai Valuev | MD | 12 | 17/12/2005 | Max Schmeling Halle, Prenzlauer Berg, Berlin, Germany | Lost WBA Heavyweight title. Valuev became the tallest (7'0") and heaviest (324 lbs) heavyweight world title holder in history. |
| NC | 41-5-1 |
James Toney | ND | 12 | 30/04/2005 | Madison Square Garden, New York, New York, United States | Ruiz's WBA & Toney's IBA Heavyweight titles on the line. Originally Ruiz lost by UD. However, he regained the title after Toney tested positive for Stanozolol after the fight. Ruiz down in 7th round. |
| Win | 41-5-1 | Andrew Golota | UD | 12 | 13/11/2004 | Madison Square Garden, New York, New York, United States | Retained WBA Heavyweight title. Ruiz down twice in the 2nd round. Ruiz had one point deducted for hitting after the break. |
| Win | 40-5-1 | Fres Oquendo | TKO | 11 (12) | 17/04/2004 | Madison Square Garden, New York, New York, United States | Retained WBA Heavyweight title. |
| Win | 39-5-1 | Hasim Rahman | UD | 12 | 13/12/2003 | Boardwalk Hall, Atlantic City, New Jersey, United States | Won interim WBA Heavyweight title. |
| Loss | 38-5-1 | Roy Jones Jr. | UD | 12 | 01/03/2003 | Thomas & Mack Center, Las Vegas, Nevada, United States | Lost WBA Heavyweight title. Jones became the first former middleweight world titlist in 106 years to win a heavyweight world title (Bob Fitzsimmons, 1897). After that Jones vacated the title on February 20, 2004, choosing to fight Antonio Tarver for the WBC and IBO Light Heavyweight titles rather than Ruiz. |
| Win | 38-4-1 | Kirk Johnson | DQ | 10 (12) | 27/07/2002 | Mandalay Bay Resort & Casino, Las Vegas, Nevada, United States | Retained WBA Heavyweight title. Johnson DQ'd for low blows. |
| Draw | 37-4-1 | Evander Holyfield | SD | 12 | 15/12/2001 | Foxwoods Resort, Mashantucket, Connecticut, United States | Retained WBA Heavyweight title by way of a draw in a lackluster fight filled with numerous clinches. |
| Win | 37–4 | Evander Holyfield | UD | 12 | 03/03/2001 | Mandalay Bay Resort & Casino, Las Vegas, Nevada, United States | Won WBA Heavyweight title. Ruiz becomes the first Latino fighter to win a major Heavyweight title. Ruiz put Holyfield down in the 11th with a right hand to the temple. |
| Loss | 36–4 | Evander Holyfield | UD | 12 | 12/08/2000 | Paris Las Vegas, Las Vegas, Nevada, United States | For vacant WBA Heavyweight title. Holyfield became the first boxer to win a version of the Heavyweight title four times. |
| Win | 36–3 | Thomas Williams | TKO | 2 (12) | 11/12/1999 | Grand Casino, Tunica, Mississippi, United States | Retained NABA Heavyweight title. |
| Win | 35–3 | Fernely Feliz | TKO | 7 (12) | 12/06/1999 | Shriner's Auditorium, Wilmington, Massachusetts, United States | Retained NABA Heavyweight title. |
| Win | 34–3 | Mario Cawley | TKO | 4 (12) | 13/03/1999 | Madison Square Garden, New York, New York, United States | Retained NABA Heavyweight title. |
| Win | 33–3 | Jerry Ballard | TKO | 4 (12) | 19/09/1998 | Georgia Dome, Atlanta, Georgia, United States | Retained NABF Heavyweight title. Won vacant NABA Heavyweight title. |
| Win | 32–3 | Tony Tucker | TKO | 11 (12) | 31/01/1998 | Ice Palace, Tampa, Florida, United States | Retained NABF Heavyweight title. Tucker down twice in the 1st and once in the 11th rounds. |
| Win | 31–3 | Ray Anis | TKO | 1 (12) | 17/06/1997 | Casino Magic, Bay St. Louis, Mississippi, United States | Retained NABF Heavyweight title. Ruiz stopped Anis in 22 seconds. |
| Win | 30–3 | Jimmy Thunder | SD | 12 | 14/01/1997 | Hale Arena, Kansas City, Missouri, United States | Won vacant NABF Heavyweight title. |
| Win | 29–3 | Yuriy Yelistratov | TKO | 3 (?) | 26/11/1996 | York Hall, Bethnal Green, London, England, United Kingdom | |
| Win | 28–3 | Nathaniel Fitch | TKO | 3 (6) | 25/10/1996 | The Roxy, Boston, Massachusetts, United States | |
| Win | 27–3 | Greg Pickrom | TKO | 1 (10) | 18/07/1996 | The Roxy, Boston, Massachusetts, United States | |
| Win | 26–3 | Doug Davis | TKO | 6 (10) | 06/06/1996 | The Roxy, Boston, Massachusetts, United States | |
| Loss | 25–3 | David Tua | KO | 1 (12) | 15/03/1996 | Convention Center, Atlantic City, New Jersey, United States | Lost WBC International Heavyweight title. Tua stopped Ruiz with a series of brutal hooks in 19 seconds. |
| Win | 25–2 | Steve Pannell | TKO | 4 (10) | 07/10/1995 | Convention Center, Atlantic City, New Jersey, United States | |
| Win | 24–2 | Willie Jackson | KO | 1 (10) | 24/08/1995 | Somerville, Massachusetts, United States | |
| Win | 23–2 | Derrick Roddy | KO | 2 (12) | 16/06/1995 | Elephant & Castle Centre, Southwark, London, England, United Kingdom | Won vacant WBC International Heavyweight title. |
| Win | 22–2 | Michael Murray | TKO | 4 (10) | 17/05/1995 | Ipswich, Suffolk, United Kingdom | |
| Win | 21–2 | Jack Basting | TKO | 1 (8) | 30/03/1995 | York Hall, Bethnal Green, London, England, United Kingdom | |
| Win | 20–2 | Boris Powell | UD | 10 | 04/02/1995 | Las Vegas, Nevada, United States | |
| Win | 19–2 | Rick Sullivan | KO | 2 (?) | 01/10/1994 | Boston, Massachusetts, United States | |
| Loss | 18–2 | Danell Nicholson | SD | 12 | 04/08/1994 | Foxwoods Resort, Mashantucket, Connecticut, United States | For vacant IBO Heavyweight title. |
| Win | 18–1 | Muhammad Askai | TKO | 2 (?) | 25/06/1994 | Revere, Massachusetts, United States | |
| Win | 17–1 | Julius Francis | TKO | 4 (8) | 25/05/1994 | Bristol, Avon, England, United Kingdom | |
| Win | 16–1 | Carl Williams | PTS | 6 | 27/11/1993 | Cleveland, Ohio, United States | |
| Win | 15–1 | Cordwell Hylton | PTS | 6 | 03/11/1993 | Whitchurch Leisure Centre, Bristol, Avon, England, United Kingdom | |
| Loss | 14–1 | Sergei Kobozev | SD | 10 | 12/08/1993 | Casino Magic, Bay St. Louis, Mississippi, United States | |
| Win | 14–0 | Exum Speight | UD | 8 | 25/06/1993 | Chelsea A.C., Chelsea, Massachusetts, United States | Speight down twice in round 2. |
| Win | 13–0 | George Chambers | KO | 1 (?) | 30/04/1993 | Chelsea, Massachusetts, United States | |
| Win | 12–0 | Mark Sonnier | TKO | 1 (?) | 16/04/1993 | Boston, Massachusetts, United States | |
| Win | 11–0 | Juan Quintana | PTS | 6 | 03/04/1993 | Somerville, Massachusetts, United States | |
| Win | 10–0 | Lorenzo Poole | KO | 1 (?) | 20/03/1993 | Revere, Massachusetts, United States | |
| Win | 9–0 | Derrick Jones | TKO | 1 (?) | 05/03/1993 | Boston, Massachusetts, United States | |
| Win | 8–0 | Phil Prince | KO | 1 (?) | 20/02/1993 | Boston, Massachusetts, United States | |
| Win | 7–0 | Miguel Rosa | TKO | 2 (?) | 30/01/1993 | National Guard Armory, Boston, Massachusetts, United States | |
| Win | 6–0 | John Basil Jackson | PTS | 6 | 16/01/1993 | Belmont, New Hampshire, United States | |
| Win | 5–0 | Jesus Rohena | TKO | 1 (?) | 10/12/1992 | Teachers Union Hall, Boston, Massachusetts, United States | |
| Win | 4–0 | John Basil Jackson | PTS | 6 | 13/11/1992 | Revere, Massachusetts, United States | |
| Win | 3–0 | Barry Kirton | TKO | 2 (?) | 03/11/1992 | Foxwoods Resort, Mashantucket, Connecticut, United States | |
| Win | 2–0 | Mike Vasser | KO | 1 (?) | 12/09/1992 | Wonderland Race Track, Revere, Massachusetts, United States | |
| Win | 1–0 | Kevin Parker | UD | 4 | 20/08/1992 | Atlantic City, New Jersey, United States | Pro debut for Ruiz. |
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