Pedro Augusto Rizzo (Portuguese pronunciation: [ˈpedɾu ˈʁizu]; born May 3, 1973) is a retired Brazilian mixed martial artist, kickboxer and Muay Thai fighter 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 Vale Tudo background, Rizzo is regarded as one of the most dangerous strikers in MMA history. Rizzo holds notable victories over former UFC champions Mark Coleman, Dan Severn, Josh Barnett, Andrei Arlovski, Ricco Rodriguez and Ken Shamrock.