Pedro Augusto Rizzo (Portuguese pronunciation: [ˈpedɾu ˈʁizu]; born 3 May 1974) is a Brazilian retired mixed martial artist and kickboxer who competed for the UFC, PRIDE, M-1 Global, and Affliction. Although he never captured the UFC Heavyweight Championship, Rizzo competed for it three times and was regarded as a top contender for many years. Coming from a Muay Thai background, Rizzo competed in Vale Tudo before transitioning into mixed martial arts. Often regarded as one of the most dangerous strikers in heavyweight history, Rizzo holds notable victories over former UFC champions Mark Coleman, Dan Severn, Josh Barnett, Andrei Arlovski, Ricco Rodriguez and Ken Shamrock.