UFC 166: Velasquez vs. Dos Santos III took place on October 19, 2013 at the Toyota Center in Houston, Texas.
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MAIN CARD (Pay-per-view, 10:00 pm ET)
• Cain Velasquez vs. Junior dos Santos – UFC Heavyweight Championship: Cain Velasquez def. Junior dos Santos via TKO (strikes) at 3:09 of Round 5.
• Daniel Cormier vs. Roy Nelson: Daniel Cormier def. Roy Nelson via unanimous decision (30-27, 30-27, 30-27).
• Gilbert Melendez vs. Diego Sanchez: Gilbert Melendez def. Diego Sanchez via unanimous decision (29-28, 30-27, 29-28).
• Shawn Jordan vs. Gabriel Gonzaga: Gabriel Gonzaga def. Shawn Jordan via TKO (punches) at 1:33 of Round 1.
• John Dodson vs. Darrell Montague: John Dodson def. Darrell Montague via knockout (punches) at 4:15 of Round 1.
PRELIMINARY CARD (Fox Sports 1, 8:00 pm ET)
• CB Dollaway vs. Tim Boetsch: Tim Boetsch def. C.B. Dollaway via split decision (30-26, 27-29, 30-26).
• Hector Lombard vs. Nate Marquardt: Hector Lombard def. Nate Marquardt via knockout (punches) at 1:48 of Round 1.
• Sarah Kaufman vs. Jessica Eye: Jessica Eye def. Sarah Kaufman via split decision (29-28, 28-29, 29-28).
• KJ Noons vs. George Sotiropoulos: K.J. Noons def. George Sotiropoulos via unanimous decision (29-28, 29-28, 30-27).
PRELIMINARY CARD (Facebook, 6:00 pm ET)
• Adlan Amagov vs. TJ Waldburger: Adlan Amagov def. T.J. Waldburger via knockout (punches) at 3:45 of Round 1.
• Tony Ferguson vs. Mike Rio: Tony Ferguson def. Mike Rio via submission (D’arce choke) at 1:52 of Round 1.
• Andre Fili vs. Jeremy Larsen: Andre Fili def. Jeremy Larsen via TKO (punches) at 0:53 of Round 2.
• Kyogi Horiguchi vs. Dustin Pague: Kyoji Horiguchi def. Dustin Pague via TKO (punches) at 3:51 of Round 2.
