- From - Copenhagen, Denmark
- Born 1 March 1979 (age 34)
- Nickname - Viking Warrior
- Fights - 48
- Wins - 46
- By KO - 35
- Losses - 2
- 14 October 2006 against Markus Beyer at Parken, Copenhagen
WBA champion Kessler fought the then WBC champion Beyer, defeating him to unify the titles. After knocking out the German in the third round Kessler immediately targeted a fight with WBO and IBF champion Joe Calzaghe. At that point Kessler had won all 38 of his fights.
- 3 November 2007 against Joe Calzaghe at the Millennium Stadium, Cardiff
Kessler suffered the first defeat of his professional career after he was outpointed by the Welshman in a closely fought contest. The Dane started strongly and caused a few problems for Calzaghe who eventually took control of the fight and finished strongly to secure a unanimous decision and unify the super middleweight belts.
- 21 November 2009 against Andre Ward in Oakland, California
Kessler was the favourite going into the Super Six Classic tournament which matched six of the world's top super middleweights against each other with the winner uniting the WBC and WBA titles. Kessler held the WBA title going into the fight with Ward but he was dominated by the American in a controversial fight. Ward admitted he caught Kessler with two headbutts after the fight was stopped in the eleventh round.
- 24 April 2010 against Carl Froch in Herning
Froch came into the fight as the WBC super middleweight title holder and unbeaten in his previous 27 matches. But, in a brutal encounter, Kessler came out the more aggressive following his previous loss to Ward and dominated the early stages of the match. Froch fought back towards the end but by then it was too late as the judges handed Kessler a unanimous decision.