Renzo Gracie is injured, faces knee surgery, and is out of the superfight with former UFC welterweight champion Matt Hughes.

The MMA legends were meant to have a superfight on Aug. 29 at ADCC 2015, held in Sao Paulo, Brazil on Aug. 29 and 30.

They had already fought at UFC 112 in 2010. Hughes won by KO.

You can see an injured Renzo Graxie in BJJ Hacks’ latest short film:

The other superfight matches are still on:

Mario Sperry vs.  Ricardo Liborio.

Roberto “Cyborg” Abreu vs. Andre Galvao.

-66kg
Rubens “Cobrinha” Charles
Jeff Glover
Justin Rader
Joao Miyao
Eddie Cummings
Geovanny “Geo” Martinez
Renan Sancar
Gabriel Marangoni De Oliveira
Tezekbaev Rasul
Asadulaev Surkhay
Jeff Curran

-77kg

Otavio Sousa
Garry Tonon
Davi Ramos
Gabriel “Palito” Rollo
Vagner Rocha
Enrico Cocco
JT Torres
Lucas Lepri
Lachlan Giles
Gamrot Mateusz
Benson Henderson

-88kg
Romulo Barral
Rafael Lovato Jr.
Keenan Cornelius
Claudio Calasans (Sao Paulio Trials winner)
Mike Perez (North American Trials winner)
Matt Arroyo (North American Trials winner)
Lucas Leite (invited)
Craig Jones (Asian Trials winner)
Zbigniew Tyszka (European Trials winner)
TBD (2nd European Trials winner)
TBD (2nd Asian Trials winner)

-99kg
João Assis
Felipe Pena
Dean Lister
Roberto “Tussa” Alencar
Cassio Francis Da Silva
Jason Bukich
Tom DeBlass
Tobias Green
Tomasz Narkun
Hector Lombard

+99kg

Bernardo Faria
Leonardo Lucio
Gabriel Lyrio Lucas
Paul Ardila
Jason Lees
Lee Hyoung chul
Alexander Trans
Orlando Sanchez

-60kg (Female)
Michelle Nicolini
Mackenzie Dern
Ana Michelle Dantas
Mayra Mello Mazz
Tammi Musumeci
Bia Mesquita

+60kg (female)
Gabi Garcia
Fernanda Mazzeli
Cristiane “Cyborg” Justino
Jéssica Da Silva Oliveira
Amanda Santana