Nuno Martins is a Brazilian jiu-jitsu black belt under Arnaldo Alves of Portuguese nationality, who worked extensively with a number of coaches from around the world, notably André Galvão, Marco Barbosa, Mário Reis, Marcelo Garcia, Lloyd Irvin, and Ricardo Vieira. Regarded as one of the top European grapplers of his generation, Martins built his reputation while competing in the International Brazilian Jiu-Jitsu Federation (IBJJF) circuit, where he conquered numerous titles, including in the Pan-American, European, and Brazilian Nationals.