| No. | Result | Record | Opponent | Type | Round, time | Date | Location | Notes |
| 45 | Loss | 40–5 | Mike Tyson | TKO | 3 (12), 0:50 | 16 Mar 1996 | MGM Grand Garden Arena, Paradise, Nevada, US | Lost WBC heavyweight title |
| 44 | Win | 40–4 | Oliver McCall | UD | 12 | 2 Sep 1995 | Wembley Stadium, London, England | Won WBC heavyweight title |
| 43 | Win | 39–4 | Mike Evans | KO | 2 (10), 3:05 | 13 May 1995 | Kelvin Hall, Glasgow, Scotland | |
| 42 | Win | 38–4 | Rodolfo Marin | KO | 1 (10), 1:05 | 18 Feb 1995 | Bath & West Country Showground, Shepton Mallet, England | |
| 41 | Win | 37–4 | Jesse Ferguson | TKO | 1 (10), 2:22 | 16 Mar 1994 | National Exhibition Centre, Birmingham, England | |
| 40 | Loss | 36–4 | Lennox Lewis | TKO | 7 (12), 1:12 | 1 Oct 1993 | National Stadium, Cardiff, Wales | For WBC heavyweight title |
| 39 | Win | 36–3 | Carl Williams | TKO | 10 (10), 0:29 | 24 Apr 1993 | National Exhibition Centre, Birmingham, England | |
| 38 | Win | 35–3 | Pierre Coetzer | TKO | 8 (10) | 17 Oct 1992 | Wembley Arena, London, England | |
| 37 | Win | 34–3 | Jose Ribalta | KO | 2 (10), 1:44 | 22 Apr 1992 | Wembley Arena, London, England | |
| 36 | Win | 33–3 | John Emmen | TKO | 1 (10), 3:00 | 20 Nov 1991 | Royal Albert Hall, London, England | |
| 35 | Loss | 32–3 | Mike Tyson | TKO | 5 (12), 2:55 | 25 Feb 1989 | Las Vegas Hilton, Winchester, Nevada, US | For WBA, WBC, IBF, and The Ring heavyweight titles |
| 34 | Win | 32–2 | Joe Bugner | TKO | 8 (10), 3:00 | 24 Oct 1987 | White Hart Lane, London, England | |
| 33 | Win | 31–2 | Reggie Gross | TKO | 8 (10) | 30 Aug 1987 | Nueva Andalucia Bullring, Marbella, Spain | |
| 32 | Win | 30–2 | Chuck Gardner | TKO | 1 (10), 0:55 | 27 Jun 1987 | Palais des Festivals et des Congres, Cannes, France | |
| 31 | Win | 29–2 | James Tillis | TKO | 5 (10), 1:57 | 24 Mar 1987 | Wembley Arena, London, England | |
| 30 | Loss | 28–2 | Tim Witherspoon | TKO | 11 (15), 2:57 | 19 Jul 1986 | Wembley Stadium, London, England | For WBA heavyweight title |
| 29 | Win | 28–1 | Gerrie Coetzee | KO | 1 (10), 1:50 | 4 Mar 1986 | Wembley Arena, London, England | |
| 28 | Win | 27–1 | Larry Frazier | KO | 2 (10), 2:14 | 4 Dec 1985 | Royal Albert Hall, London, England | |
| 27 | Win | 26–1 | Anders Eklund | KO | 4 (12), 0:20 | 1 Oct 1985 | Wembley Arena, London, England | Won European heavyweight title |
| 26 | Win | 25–1 | Lucien Rodriguez | TKO | 1 (10), 2:39 | 26 Mar 1985 | Wembley Arena, London, England | |
| 25 | Win | 24–1 | Phillip Brown | PTS | 10 | 27 Nov 1984 | Wembley Arena, London, England | |
| 24 | Win | 23–1 | Jeff Jordan | TKO | 3 (10), 1:50 | 6 Nov 1984 | Royal Albert Hall, London, England | |
| 23 | Win | 22–1 | Ken Lakusta | KO | 2 (10) | 25 Sep 1984 | Wembley Arena, London, England | |
| 22 | Loss | 21–1 | James Smith | KO | 10 (10) | 13 May 1984 | Wembley Arena, London, England | |
| 21 | Win | 21–0 | Juan Antonio Figueroa | TKO | 1 (10), 0:57 | 13 Mar 1984 | Wembley Arena, London, England | |
| 20 | Win | 20–0 | Walter Santemore | KO | 4 (10), 0:50 | 6 Dec 1983 | Royal Albert Hall, London, England | |
| 19 | Win | 19–0 | Floyd Cummings | TKO | 7 (10), 2:43 | 11 Oct 1983 | Royal Albert Hall, London, England | |
| 18 | Win | 18–0 | Bill Sharkey | KO | 1 (10), 2:08 | 27 Sep 1983 | Wembley Arena, London, England | |
| 17 | Win | 17–0 | Mike Jameson | KO | 2 (10), 1:30 | 9 Jul 1983 | DiVinci Manor, Chicago, Illinois, US | |
| 16 | Win | 16–0 | Barry Funches | TKO | 5 (10), 0:52 | 31 May 1983 | Royal Albert Hall, London, England | |
| 15 | Win | 15–0 | Scott LeDoux | TKO | 3 (10), 1:35 | 3 May 1983 | Wembley Arena, London, England | |
| 14 | Win | 14–0 | Eddie Neilson | TKO | 3 (10), 0:25 | 5 Apr 1983 | Royal Albert Hall, London, England | |
| 13 | Win | 13–0 | Winston Allen | TKO | 2 (10), 1:25 | 1 Mar 1983 | Royal Albert Hall, London, England | |
| 12 | Win | 12–0 | Peter Mulindwa Kozza | KO | 3 (10), 1:37 | 8 Feb 1983 | Royal Albert Hall, London, England | |
| 11 | Win | 11–0 | Stewart Lithgo | RTD | 4 (8), 3:00 | 18 Jan 1983 | Royal Albert Hall, London, England | |
| 10 | Win | 10–0 | Gilberto Acuna | TKO | 1 (10), 0:40 | 7 Dec 1982 | Royal Albert Hall, London, England | |
| 9 | Win | 9–0 | George Butzbach | TKO | 1 (8), 2:00 | 23 Nov 1982 | Wembley Arena, London, England | |
| 8 | Win | 8–0 | Rudy Gauwe | KO | 2 (8), 0:20 | 9 Nov 1982 | Royal Albert Hall, London, England | |
| 7 | Win | 7–0 | Ali Lukasa | TKO | 2 (8) | 23 Oct 1982 | Berlin, Germany | |
| 6 | Win | 6–0 | George Scott | TKO | 1 (8), 2:42 | 14 Sep 1982 | Wembley Arena, London, England | |
| 5 | Win | 5–0 | Tony Moore | TKO | 2 (8) | 1 Jun 1982 | Royal Albert Hall, London, England | |
| 4 | Win | 4–0 | Ronald Gibbs | TKO | 4 (8) | 4 May 1982 | Wembley Arena, London, England | |
| 3 | Win | 3–0 | Abdul Muhaymin | KO | 1 (8), 2:25 | 20 Apr 1982 | Royal Albert Hall, London, England | |
| 2 | Win | 2–0 | Harvey Steichen | TKO | 2 (8), 2:30 | 30 Mar 1982 | Wembley Arena, London, England | |
| 1 | Win | 1–0 | Lupe Guerra | KO | 1 (8) | 17 Mar 1982 | Royal Albert Hall, London, England | |