Check out the full ‘Countdown To UFC 166’ preview below featuring a closer look at the three biggest fights on the pay-per-view card: Cain Velasquez Vs Junior Dos Santos III, Roy Nelson Vs Daniel Cormier and Gilbert Melendez Vs Diego Sanchez.

Cain Velasquez Vs Dos Santos III:

Roy Nelson Vs Daniel Cormier:

Gilbert Melendez Vs Diego Sanchez:

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