Renato Sobral da Cunha, also known as "Babalu", is a retired Brazilian Luta Livre submission grappler, mixed martial artist, and was the former Strikeforce Light Heavyweight Champion. Sobral previously fought in the Ultimate Fighting Championship, where he posted a 6–4 record and has also competed for Bellator, RINGS, Jungle Fight, Cage Rage, Affliction, and ONE Championship. He is the Head Instructor of Babalu's Iron Gym Cerritos and has a Luta Livre black belt under Marco Ruas and also a Brazilian jiu-jitsu black belt under Carlos Gracie Jr.

Luta Livre, known in Brazil as Luta Livre Brasileira or Luta Livre Submission, and also Brazilian Submission Wrestling, is a Brazilian martial arts and combat sport created by Euclydes Hatem in Rio de Janeiro. Primarily a mixture of catch wrestling and kosen judo, there is also ground striking with the hands, feet, knees and elbows. Notable practitioners include Marco Ruas, Ebenezer Fontes Braga, Johil de Oliveira, Alexandre Franca Nogueira, Renato Sobral, Gesias Cavalcante, Pedro Rizzo, Darren Till and José Aldo.