The UFC has released the Countdown To UFC 166 footage, and Â you can see the preview of the main event right here. UFC 166: Velasquez Vs Dos Santos III takes place on October 19 at the Toyota Center in Houston, Texas. The main event will be the trilogy fight between current Heavyweight Champion Cain Velasquez and Former UFC Heavyweight Champion Junior dos Santos. In the co main event, Strikeforce Heavyweight Grand Prix winner Daniel Cormier will be taking on Roy Nelson.
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