While training as an amateur wrestler, Kerr became interested in
mixed martial arts as a way to earn money. He, his long-time friend and training partner
Mark Coleman and
Tom Erikson were initially scouted by Richard Hamilton, who had managed
Ultimate Fighting Championship fighter
Don Frye until a falling out and was now offering a place in
UFC 10 against him. However, nothing came from it, and Coleman ended up hunting down the chance. Eventually, Kerr and Hamilton arranged for the former to train with Coleman and fight at the
Brazilian event World Vale Tudo Championship 3 in January 1997. His appearance was highly anticipated, as other wrestlers like Coleman or Erikson were already known in the MMA community, though there were doubts about Kerr's true skills. Following his win of UFC 15, Kerr decided to fight in Japan for the
Pride Fighting Championships due to the UFC's promotional difficulties and Pride's larger paychecks.
Pride Fighting Championships After considering an offer from Japanese promotion
Shooto, Kerr signed up with Pride for a matchup against fellow UFC champion
Royce Gracie at
Pride 2 in 1998. The match, as per Gracie's demands, would have been without time limits or referee stoppages. However, Royce pulled out after the fight had been advertised. Kerr was then slated to fight
Branco Cikatic. Kerr utilized the same ground-and-pound fighting style from his previous fights, taking his opponent onto the mat and then using strikes and submissions to try to finish the fight. Kerr was said to be an improved version of
Mark Coleman because he was proficient in wrestling, submissions, and take downs, with good
cardio and an ever-improving striking game under his tutelage with
Bas Rutten. Around the time that Kerr entered PRIDE, some considered Kerr to be one of the top MMA Heavyweight fighters in the world. Kerr won four bouts between Pride 2 and
Pride 6. However, his status was soon questioned after his first bout with
Igor Vovchanchyn at
Pride 7, in which he was knocked out by illegal knee strikes. Even though the loss was overturned and changed to a "No Contest" ruling, Kerr admitted that the initial loss had been a difficult decision for him to face.
Later career After his loss to
Yoshihisa Yamamoto, Kerr was supposed to make his comeback against
Wes Sims in the American Championship Fighting (ACF) on May 6, 2006, at the
Denver Coliseum, but was not medically cleared to fight due to a hand injury. On February 11, 2007, Kerr fought
Mustafa Al Turk at
Cage Rage 20: 'Born 2 Fight'. Kerr lost his footing after an attempted roundhouse kick and he was mounted, stunned with a series of blows and submitted within the first round. Kerr was supposed to fight
Sean O'Haire on August 17 in the Global Fighting Championships first show at the
Mohegan Sun Arena but was cancelled due to his high blood pressure and his license was suspended indefinitely. Mark Kerr fought in the World Cage Fighting Organization (WCO) in November 2007, winning his bout against Steve Gavin by Americana after 1:39 of the first round. In 2008, Kerr launched a comeback. In March, Mark beat Chuck Huus by Submission (Keylock/Americana) at CCCF – Battle on the Border. In April, he lost to
Oleg Taktarov in one round by kneebar. Two months later, Kerr was choked out in the opening round by deaf fighter Tracy Willis at a C-3 Fights show in
Concho, Oklahoma. On July 26, Ralph Kelly stopped Kerr in the first round at Xp3. On September 27, 2008, Kerr lost to fellow heavyweight
Jeff Monson by rear-naked choke, in a battle of former
ADCC champions. On August 28, 2009, Kerr faced fellow wrestler
Muhammed Lawal at an M-1 Global event. Kerr was taken down and subsequently pounded into unconsciousness in just 25 seconds, receiving several blows to the head after he was clearly unable to defend himself. This led the event's TV commentators to openly speculate that Kerr's fighting career was over.
Guy Mezger, in the post-fight discussion, suggested that it was time for Kerr to "find another vocation". Kerr only won four of his 15 fights since 2000 and lost his last five fights.
Hall of Fame During
UFC 316's broadcast in June 2025, Kerr was announced as the next "pioneer wing"
UFC Hall of Fame inductee during International Fight Week festivities in Las Vegas this June. == Submission wrestling career ==