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[ads2]The UFC 166: Velasquez vs. Dos Santos III card is set to take place in Houston, Texas, on October 19, and will take place at the Toyota Center. The event will be headlined by the heavyweight trilogy between Cain Velasquez and Junior dos Santos with a heavyweight co-main event between Daniel Cormier and Roy Nelson. Also, lightweights Gilbert Melendez and Diego Sanchez will go to war on what should be a great night of fights. Check out the Countdown to UFC 166 episode below: