Marcus “The Irish Hand Grenade” Davis began his martial arts education at age 8. He began studying Karate in Bangor, Maine because there were no boxing gyms available to him. Boxing finally came into his life in 1987, and he had his first amateur bout a short while later. Davis turned pro in 1991 and boxed professionally for nine years before retiring in 2000 with a record of 17-1-2. His lone loss was the last bout of his career; a TKO defeat at the hands of 34 year old Ed Bryant.
Although, Davis began grappling training in 1995, it wasn’t until his retirement in 2000 that he joined Miletich Fighting Systems along with his friend, Tim Sylvia. After less than three years of training, Davis made his mma debut at ISCF – Friday Night Fights in Georgia. He TKO’ed his first opponent two minutes into the first round. He then lost a split decision in his second bout to future UFC star, Thiago Alves. Davis made it two losses in a row when he was submitted by Nuri Shakir at MMA – Eruption in April of 2004. Davis rebounded from the losses with a rematch of his first opponent, Shawn Gay. In their second meeting, he TKO’ed Gay 36 seconds faster than the last time.
9 months after the Gay rematch, Davis earned a Technical Submission victory over Renat Myzabekov at CZ 10 – Ground War. Following an unsuccessful stint on the second season of The Ultimate Fighter, Davis was TKO’ed by Melvin Guillard midway through the second round. Following his loss to Guillard, Davis put together a 5 fight win streak in regional promotions winning 3 fights by submission, 1 by TKO and one by unanimous decision.
In Davis’ return to the Octagon he extended that streak from 5 to 11. He submitted Forrest Petz in the waning seconds of the first round with a guillotine choke at Ortiz. He won a unanimous decision over Shonie Carter and submitted Pete Spratt with an Achilles lock. Following the Spratt victory he earned Knockout of the Night honors in his bout with Jason Tan at UFC 72 in Belfast, Northern Ireland. In his next bout he earned Fight of the Night and Submission of the Night bonuses with his armbar victory over Paul Taylor. Davis ended his streak with a 64 second knockout of Jess Liaudin at UFC 80.
6 months after the Liaudin knockout, Davis dropped a unanimous decision to Mike Swick at UFC 85. He rebounded with victories over Paul Kelly and Chris Lytle. He went 1-4 in his last five UFC bouts prompting the organization to release him in January of 2011. During that stretch he TKO’ed Jonathan Goulet but was knocked out by Ben Saunders and Jeremy Stephens, submitted by Nate Diaz and started it all off with a split decision loss to Dan Hardy. Since leaving the UFC he has gone 5-1 with 1 no contest. He is expected to face Alexander Sarnavskiy in the Bellator Season 9 Lightweight tournament on September 27th, 2013.