Marcus Phelan is a professional Irish grappler and a black belt in jiu-jitsu under Darragh O'Conaill, representing the East Coast Jiu-Jitsu team in the sport's international circuit. Phelan became widely recognized as one of Europe's top lightweights while competing in the International Brazilian Jiu-Jitsu Federation (IBJJF) tour, where he conquered numerous important gold medals in events such as the Dublin, Berlin, and London Opens.