http://91.ufc.com - UFC 91: Couture vs. Lesnar is TONIGHT. Its the biggest fight in UFC history! 3-time UFC heavyweight Champ, Randy Couture returns to the octagon and puts his title on the line against the biggest opponent of his career, wrestling powerhouse Brock Lesnar. Dont miss UFC 91: COUTURE vs. LESNAR tonight LIVE on Pay-Per-View.