Gunnar Nelson made history in September 2012 by becoming the first Icelandic fighter to sign a multi-fight contract with the Ultimate Fighting Championship (UFC), marking a pivotal moment in his professional mixed martial arts career. Before his MMA debut in May 2007, Nelson cultivated a formidable background in martial arts, earning the Icelandic Juvenile Kumite Championship title three consecutive times in 2003, 2004, and 2005, and was recognized as Iceland’s most promising up-and-coming karate talent in 2005. Transitioning to Brazilian Jiu-Jitsu and grappling, he rapidly achieved his BJJ blue belt in 2006, brown belt in 2008, and the coveted black belt in 2009. His grappling prowess was further underscored by winning a Gold Medal at the Pan American Championship (Gi) Middleweight Brown Belt in 2009, a Gold Medal at the Pan American Championship (No-Gi) Middleweight Black Belt in 2009, and a Silver Medal at the World Jiu-Jitsu Championship (Gi) Middleweight Brown Belt, all in 2009.
He notably maintains a low training weight, requiring only a 56 pound weight cut for fights. His preference for fighting and sparring with minimal hand wraps and small gloves, which he states provides a better feel for his strikes and has prevented hand injuries, further highlights his disciplined and innovative approach to combat sports. Most recently, Nelson secured another ‘Performance of the Night’ bonus for his submission victory against Bryan Barberena in 2023, reaffirming his continued elite performance within the highly competitive UFC Welterweight division. His consistent achievements, combined with his thoughtful advocacy for fighter well-being, solidify his status as a respected and influential figure within the global mixed martial arts community.