DESC: Taped live in Las Vegas on January 31, 2004, UPC 46 features eight brutal matches. In the main event, Light Heavyweight Champion Randy "The Natural" Couture goes against Brazil's Vitor "The Phenom" Belfort in a rematch for the title. Next, BJ Penn challenges Matt Hughes for the Welterweight belt. On the undercard: UFC stars Frank Mir, Carlos Newton, Lee Murray, Josh Thomson, Hermes Franca, and "Charuto" Verissimo.