UFC 166: Velasquez vs. dos Santos III was a mixed martial arts event held on October 19, 2013, at the Toyota Center in Houston, Texas. The main event was a UFC Heavyweight Championship bout between the current champion Cain Velasquez and top contender Junior dos Santos. The two have split their two previous encounters with Dos Santos winning the first bout via first round knockout and then Velasquez winning the rematch via unanimous decision at UFC 155.
Cain Velasquez
Junior dos Santos
Daniel Cormier
Roy Nelson
Gilbert Melendez
Diego Sanchez
Gabriel Gonzaga
Shawn Jordan
John Dodson
Darrell Montague
Tim Boetsch
C.B. Dollaway
Hector Lombard
Nate Marquardt
Jessica Eye
Sarah Kaufman
K.J. Noons
George Sotiropoulos
Adlan Amagov
TJ Waldburger
Tony Ferguson
Mike Rio
Andre Fili
Jeremy Larsen
Kyoji Horiguchi
Dustin Pague