Professional Boxing Record
| 64 Wins (43 knockouts, 21 decisions), 3 Losses (2 TKO, 1 retirement), 0 Draws | ||||||
| Res. | Opponent | Type | Rd., Time | Date | Location | Notes |
| Loss | Evander Holyfield | TKO | 10 (12) | 2011-05-07 | Koncerthuset, Copenhagen, Denmark | WBF Heavyweight title on the line, only for Evander Holyfield |
| Win | Uriah Grant | Decision (unanimous) | 8 (8) | 2002-04-19 | Frederiksberg, Denmark | |
| Win | Ken Murphy | Decision (unanimous) | 8 (8) | 2001-11-16 | Roskilde, Denmark | |
| Loss | Mike Tyson | RTD | 7 (10) | 2001-10-13 | Copenhagen, Denmark | Stripped of IBC Heavyweight title |
| Win | Orlin Norris | Decision (unanimous) | 12 (12) | 2001-06-16 | Brøndby, Denmark | Retained IBC Heavyweight title |
| Win | Benji Baker | TKO | 6 (8) | 2001-04-27 | Aalborg, Denmark | |
| Win | Dicky Ryan | Decision (unanimous) | 8 (8) | 2000-12-01 | Viborg, Denmark | |
| Win | Andy Sample | TKO | 2 (8) | 2000-11-03 | Copenhagen, Denmark | |
| Win | Kevin Cook | KO | 1 (8) | 2000-10-06 | Næstved, Denmark | |
| Win | Jeremy Williams | TKO | 5 (12) | 2000-04-28 | Copenhagen, Denmark | Retained IBC Heavyweight title |
| Win | Thomas Williams | KO | 3 (8) | 2000-03-31 | Esbjerg, Denmark | |
| Win | Jeff Pegues | KO | 3 (8) | 2000-02-18 | Aalborg, Denmark | |
| Win | Troy Weida | KO | 8 (12) | 2000-01-14 | Kolding, Denmark | Won IBC Heavyweight title |
| Win | Frank Wood | KO | 2 (8) | 1999-11-26 | Viborg, Denmark | |
| Win | Don Normand | KO | 1 (8) | 1999-10-29 | Copenhagen, Denmark | |
| Win | Dale Crowe | Decision (unanimous) | 8 (8) | 1999-10-01 | Randers, Denmark | |
| Win | Shane Sutcliffe | KO | 5 (8) | 1999-09-03 | Copenhagen, Denmark | |
| Loss | Dicky Ryan | TKO | 10 (10) | 1999-06-18 | Vejle, Denmark | Ryan down in the 4th round. Nielsen throws in towel in 10th and is rushed to hospital, suffers from dehydration. Nielsen is stripped of IBO World Championship, even though it was not on the line. |
| Win | Tim Witherspoon | TKO | 4 (10) | 1999-04-16 | Frederiksberg, Denmark | Nielsen equals Rocky Marciano's 49-0 record |
| Win | Paul Phillips | KO | 2 (8) | 1999-03-19 | Frederiksberg, Denmark | |
| Win | Peter McNeeley | KO | 3 (8) | 1999-02-12 | Frederiksberg, Denmark | |
| Win | Dan Murphy | TKO | 2 (8) | 1998-11-27 | Risskov, Denmark | |
| Win | Lionel Butler | KO | 1 (12) | 1998-11-06 | Copenhagen, Denmark | Retained IBO Heavyweight Title |
| Win | Garing Lane | KO | 2 (8) | 1998-09-18 | Aalborg, Denmark | |
| Win | Terry Ray | TKO | 5 (8) | 1998-09-04 | Copenhagen, Denmark | |
| Win | George Linberger | TKO | 2 (8) | 1998-09-04 | Kolding, Denmark | |
| Win | Joey Guy | Decision (unanimous) | 8 (8) | 1998-02-27 | Korsør, Denmark | |
| Win | Donnell Wingfield | KO | 1 (8) | 1997-12-05 | Aalborg, Denmark | |
| Win | Don Steele | KO | 2 (12) | 1997-11-14 | Copenhagen, Denmark | Retained IBO Heavyweight Title |
| Win | Crawford Grimsley | TKO | 6 (8) | 1997-10-03 | Copenhagen, Denmark | |
| Win | Bruce Douglas | KO | 1 (8) | 1997-09-12 | Kolding, Denmark | |
| Win | Marcos Gonzales | TKO | 4 (8) | 1997-07-12 | Stateline, United States | |
| Win | James Pritchard | KO | 3 (8) | 1997-06-13 | Slagelse, Denmark | |
| Win | Damon Reed | Decision (unanimous) | 8 (8) | 1997-05-02 | Randers, Denmark | |
| Win | Pedro Daniel Franco | Decision (unanimous) | 8 (8) | 1997-03-14 | Odense, Denmark | |
| Win | Larry Holmes | Decision (split) | 12 (12) | 1997-01-24 | Brøndby, Denmark | Retained IBO Heavyweight Title |
| Win | Marcus Rhode | TKO | 2 (8) | 1996-11-30 | Wiener Neustadt, Austria | |
| Win | Andrew Maynard | TKO | 6 (8) | 1996-10-18 | Vejle, Denmark | |
| Win | Jerry Halstead | KO | 2 (8) | 1996-09-13 | Ringsted, Denmark | |
| Win | Mike Hunter | TKO | 5 (12) | 1996-05-31 | Copenhagen, Denmark | Retained IBO Heavyweight Title |
| Win | Salvador Maciel | TKO | 3 (8) | 1996-04-26 | Aalborg, Denmark | |
| Win | Phil Jackson | TKO | 6 (12) | 1996-03-29 | Copenhagen, Denmark | Retained IBO Heavyweight Title |
| Win | Jeff Lally | TKO | 2 (8) | 1996-02-16 | Middelfart, Denmark | |
| Win | Tony LaRosa | TKO | 2 (12) | 1996-01-12 | Frederiksberg, Denmark | Won IBO Heavyweight Title |
| Win | Carlos De Leon | TKO | 3 (8) | 1995-11-24 | Randers, Denmark | |
| Win | Tony Tubbs | TKO | 4 (10) | 1995-10-20 | Copenhagen, Denmark | |
| Win | Terry Davis | Decision (points) | 8 (8) | 1995-09-08 | Aalborg, Denmark | |
| Win | Jim Huffman | DQ | 6 (8) | 1995-06-09 | Kolding, Denmark | |
| Win | Tim Noble | Decision (points) | 8 (8) | 1995-03-17 | Copenhagen, Denmark | |
| Win | Doug Davis | TKO | 6 (8) | 1995-03-11 | Las Vegas, United States | |
| Win | Matt Green | KO | 1 (8x3) | 1995-02-18 | Somerset, United Kingdom | |
| Win | Jeff Lampkin | Decision (unanimous) | 8 (8) | 1995-01-13 | Aalborg, Denmark | |
| Win | Terry Anderson | KO | 5 (8) | 1994-11-11 | Randers, Denmark | |
| Win | James Smith | TKO | 5 (8) | 1994-10-07 | Copenhagen, Denmark | |
| Win | George Stephens | KO | 1 (8) | 1994-06-12 | Kolding, Denmark | |
| Win | Ken Merritt | KO | 8 (8) | 1994-04-22 | Aalborg, Denmark | |
| Win | Ron Gullette | KO | 3 (8) | 1994-03-25 | Aakirkeby, Denmark | |
| Win | Ross Puritty | Decision (points) | 4 (4) | 1994-03-05 | Los Angeles, United States | |
| Win | Mike Acey | KO | 2 (8) | 1994-02-18 | Randers, Denmark | |
| Win | Mike Dixon | Decision (unanimous) | 8 (8) | 1993-12-05 | Randers, Denmark | |
| Win | Jean Chanet | Decision (unanimous) | 6 (6) | 1993-10-29 | Korsør, Denmark | |
| Win | Roger McKenzie | Decision (unanimous) | 6 (6) | 1993-09-17 | Copenhagen, Denmark | |
| Win | Jean Weiss | Decision (points) | 6 (6) | 1993-06-11 | Randers, Denmark | |
| Win | Carl Gaffney | Decision (points) | 6 (6) | 1993-02-12 | Randers, Denmark | |
| Win | Steve Gee | Decision (points) | 6 (6) | 1992-11-27 | Randers, Denmark | |
| Win | Terry Armstrong | Decision (points) | 6 (6) | 1992-09-04 | Copenhagen, Denmark | |
Read more about this topic: Brian Nielsen (boxer)
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