Kevin McBride McBride's career-defining performance was a victory over Mike Tyson, former undisputed world heavyweight champion, via a 6th-round TKO on 11 June 2005 when Tyson quit the fight by informing the referee that he would not be able to continue to round Seven in the MCI Center in Washington, D.C. The aged Tyson explained in a post fight interview that his heart wasn't into the sport any more. Tyson announced his retirement after the bout, saying "I'm not going to disrespect the sport anymore by losing to this caliber of fighter". McBride has suffered six losses by knockout—including twice against fighters
Scott Gammer once again when he boxed John McDermott later that year in an elimination bout. The contest took place in Sheffield but ended up with another defeat for the Welshman. Following this setback Gammer announced his retirement from boxing and McDermott went on to challenge for the title. The retirement did not last that long however as Gammer returned to action in August 2008 when he challenged Francesco Pianeta for the EU Heavyweight championship in Germany. The fight ended with another defeat for Gammer, although this time it was due to a corner retirement when Gammer broke his hand in the