The event saw victories by former UFC Heavyweight Champions Andrei Arlovski and Josh Barnett, with Barnett avenging an earlier loss to Pedro Rizzo, and by former UFC Light-heavyweight Champion Vitor Belfort.
The name "First Defense" refers to a scheduled Heavyweight Title Bout between Kevin Randleman and Pedro Rizzo, which did not happen due to injury.
The card was headlined by two Championship Bouts, Randy Couture faced Pedro Rizzo for the Heavyweight Title, and Matt Hughes faced Carlos Newton for the Welterweight Title.
This was Abbott's first MMA bout since 1998, when he was defeated by Pedro Rizzo at Ultimate Brazil.
San Pedro Sula | San Pedro | Pedro Almodóvar | San Pedro de Macorís | Pedro Infante | Pedro II of Brazil | Pedro Martínez | Pedro Vargas | San Pedro, Los Angeles | Pedro Rosselló | San Pedro Town | Colégio Pedro II | Pedro Rodríguez | Pedro Fernández de Castro | Pedro Damián | Pedro Álvares Cabral | San Pedro de Atacama | Point Pedro | Pedro Juan Caballero, Paraguay | Pedro Juan Caballero | Pedro Cieza de León | Pedro Bell | Dom Pedro | Colégio Pedro II (Rio de Janeiro) | São Pedro | Pedro Torres | Pedro Rodríguez (racing driver) | Pedro Rizzo | Pedro Pierluisi | Pedro Paterno |