Nickname Irish Hand Grenade, The Celtic Warrior
Height 5' 10"
Born August 24, 1973 (1973-08-24) (age 34)
Fighting out of Bangor, Maine
Town of birth Houlton, Maine
Fighting style Boxing
Mixed martial arts record
By knockout 4
By submission 7
No contests 0
Marcus Paul Davis (born August 24, 1973), nicknamed "The Irish Hand Grenade" (and "The Celtic Warrior" whilst fighting in Ireland), is an American mixed martial arts fighter. He currently fights as a welterweight in the UFC and in independent MMA promotions in the U.S.. He was a contestant on the Ultimate Fighter 2 on Spike TV.
Marcus began began boxing at 14, turning pro at the age of 19 with a second round TKO of Luis Guzman in April 1993. He compiled a professional record of 17-1-2 over the next seven years on the New England circuit. In his last fight as a boxer, he suffered a knockout loss to 34 year old Ed Bryant which lead him to reconsider his future as a successful boxer. He then became excited with the challenge of mixed martial arts, much to the bemusement of his peers. Considered on the cusp of the big-time as the number one ranked super middleweight in New England before losing to Ed Bryant, he retired from boxing after the knockout loss in October 2000.
Prior to boxing, Marcus did martial arts from the age of eight. In 1995, Davis, then based in Massachusetts, started grappling training with Joe Maffei. In 1997, he moved back to Bangor and opened up a MMA school, whilst running a bar. The doormen took classes at the school, one of whom was Tim Sylvia. After Tim joined Miletich Fighting Systems in 2000, Marcus quickly followed. More recently, he has trained with Mark Dellagrotte and his own team in Bangor, Team Irish. He also frequently visits Jorge Gurgel's main MMA academy in West Chester, Ohio. He and Gurgel struck up a friendship on The Ultimate Fighter 2.
Marcus Davis entered professional MMA on August 22, 2003 with a first round TKO of Shaun Gay. Though later describing himself as "one-dimensional", he put together a 3-2 pro MMA record.
In 2005, Marcus was a contestant on The Ultimate Fighter 2. Coming in with reputed boxing skills, he picked Joe Stevenson in episode four in what proved to be a mismatch, as Davis was quickly taken down by the eventual winner and submitted. He was later brought back in episode 10 to cover for Jason Von Flue, who suffered a cut on his forehead in practice, though Von Flue's cut was healed enough in time to fight. Marcus fought on the undercard of the finale, where he lost to Melvin Guillard.
Following the series, Davis strongly considered retirement but recuperated from a shoulder injury picked up against Joe Stevenson and went back to MMA training. He has subsequently bounced back with eight wins, including a triumphant return to the UFC at Ortiz vs. Shamrock 3: The Final Chapter. He now considers himself a mixed martial artist and not a boxer fighting in MMA.
Davis' most recent fight was against Paul Taylor at UFC 75 in London, England. Early in the round, Davis was knocked down by a kick to the neck, but was able to recover, gain a dominant position, and secure an armbar as Taylor desperately scrambled to regain control. Marcus won Fight of the night as well as submission of the night for this fight. His next fight is scheduled for UFC 80 in Newcastle, England against Jess Liaudin.
Marcus is twice married and twice divorced, though he has reconciled with his second wife and they're currently in a relationship. He has four children, Duncan, Alexis, Emma, and Monica.  His family comes from Waterford, Ireland.