It's the biggest fight in mixed martial arts history! 3-time UFC Heavyweight Champ Randy "The Natural" Couture returns to the Octagon and puts his title on the line against the biggest opponent of his career, wrestling powerhouse Brock Lesnar. Can the legend prevail? Or will a new hero rise? MGM Grand Garden Arena, Nevada UFC 91: Couture vs. Lesnar - Saturday, November 15, live on Pay-Per-View from the MGM Grand Garden Arena in Las Vegas, NV.