Roberto Magalhães, commonly known by jiu-jitsu practitioners and fans as "Roleta", is regarded as one of the All-Time Greatest BJJ competitors of the sport and one of the greatest innovators of the modern grappling game, particularly through his inverted guard, a position that revolutionized the sport in the 1990s. A 4x World Champion, Roleta earned his black belt training under Carlinhos Gracie in the Gracie Barra academy of Rio de Janeiro, later opening his own academy, Roleta BJJ.