Samuel Nagai Hatchwell is a Brazilian grappler and a jiu-jitsu black belt under Keiser Girão, who also worked extensively under the tutelage of his own brother - Jackson Nagai, as well as Marcos Souza, Carlos Holanda, and Lucas Leite. Nagai broke through as one of the sport's most respected competitors at the IBJJF 2018 World Championship.