The mixed martial arts (MMA) night is headlined by a Heavyweight title fight between division champion Cain Velasquez and Junior Dos Santos. With a win, Velasquez could cement himself as the top heavyweight fighter in the history of the promotion, according to UFC President Dana White.
The night kicks off soon (6:15 p.m. ET) with eight solid "Prelims" under card fights that feature some of the best young talent in the UFC.
To watch the Facebook "Prelims" live online right now click here (start time is 6:15 p.m. ET) before tuning into Fox Sports 1 (formerly SPEED) at 8 p.m. ET.
Meantime, check out our live Twitter.com reactions from around the social scene, which will be updated throughout the evening with the best the Internets has to offer.
Here we go!:
That ref sucks!!!!!— Dana White (@danawhite) October 19, 2013
Waldburger is out cold.— John Morgan (@MMAjunkieJohn) October 19, 2013
Jeezuz, Waldburger is OUT.— Erik Fontanez (@Erik_Fontanez) October 19, 2013
Poor TJ Waldburger. You didn't need that last left hand. No one did.— Ben Fowlkes (@benfowlkesMMA) October 19, 2013
Anthony Ferguson vs. Mike Rio
Mike Rio is bummed out, but don't worry, kid. You might have a trilogy against Luis Palomino (and his hair) waiting for you in CFA on AXS!— Jordan Breen (@jordanbreen) October 19, 2013
Fantastic performance by Tony Ferguson. His striking, takedown defense and submission game were all on point. Glad to have El Cucuy back!— Brian Hemminger (@BrianHemminger) October 19, 2013
Wow!!! How good did Tony Ferguson look tonite?!?— Dana White (@danawhite) October 19, 2013
All BJJ dojos should make brown belts into piano key belts.— CagePotato.com (@cagepotatomma) October 19, 2013
Young Dre Feelz makes a gashed up, haemorrhaging Jeremy Larsen hit his knees and beg for bloody mercy. Two delightfully violent UFC debuts.— Jordan Breen (@jordanbreen) October 19, 2013
this week on the walkin dead... damn this shit too real younahmean.— GFKonMMA (@GFKonMMA) October 19, 2013
Why is ethnic Rory MacDonald talking about Sacramento? I thought he was ethnic Canadian.— laura gilbert (@TGILaura) October 19, 2013
RECESS HOUR BEATDOWN B— GFKonMMA (@GFKonMMA) October 19, 2013
Stop the presses! A Japanese prospect has lived up to the hype!— CagePotato.com (@cagepotatomma) October 19, 2013
And if you were on the fence, now you sorta see why Horiguchi isn't just another lame Japanese guy with a haircut. Twin cannons on this boi.— Jordan Breen (@jordanbreen) October 19, 2013
Pague just doesn't fight smart.— Tim B (@TB_Money) October 19, 2013
George Sotiropoulos vs. KJ Noons
Noons put Sotiropoulos on crazy legs and decided to admire him from afar. No urgency in looking for the finish. Puzzling. #UFC166— Mike Chiappetta MMA (@MikeChiappetta) October 20, 2013
Noons had Sotiropoulos hurt so naturally he didn't push the action. #UFC166— Matthew Roth (@MattRoth512) October 20, 2013
Flat-footed, looking for one big shot, looking up at the clock. Noons may be very unhappy in a minute. Should not have been this close.— Greg Savage (@TheSavageTruth) October 20, 2013
So next time, when either Noons or G-Sot are matched with someone with a pulse? Please bet against them. They are both looking pretty shot.— Jonathan Snowden (@mmaencyclopedia) October 20, 2013
Am I the only one who imagines KJ Noons mumbling, 'Not cool, brah,' every time he gets hit?— Ben Fowlkes (@benfowlkesMMA) October 20, 2013
Not a robbery because the first 2 rounds were insanely close, but Kaufman probably should have won that. Props to Eye for surviving the 3rd— Brian Hemminger (@BrianHemminger) October 20, 2013
The fans are booing Jessica Eye winning by split decision but it was the right score. A lot of fighters sure are ignoring game planning.— FightOpinion (@FightOpinion) October 20, 2013
Nate Marquardt deserves no sympathy from anyone, but it is worth noting he's been KO'd three times, all by pantheon-level coma inducers.— Jordan Breen (@jordanbreen) October 20, 2013
Hector Lombard knocks out Nate Marquardt at 1:48 of round one. Hell of a 170 debut. Says afterward the UFC was right to make him cut down.— Shaun Al-Shatti (@shaunalshatti) October 20, 2013
How much does the UFC want Marquardt to be a drooling, non-functional 50-year-old? You get Ellenberger and Lombard back-to-back.— RJ Clifford (@RJcliffordMMA) October 20, 2013
That Hector Lombard...the 170 version...SCARY.— Dave Sholler (@Sholler_UFC) October 20, 2013
Welcome to 170, Hector Lombard. That was the hulking performance people wanted. Lombard ended Marquardt 2 minutes into the first with fists.— Josh Gross (@JoshGrossESPN) October 20, 2013
Tim Boetsch vs. CB Dolloway
Those scorecards were all over the place!! Thought we had a draw or a one-point CB win. Great fight— Jimmy Smith (@jimmysmithmma) October 20, 2013
I can see Boetsch winning the second and third barely, but I still gave all three rounds to Dollaway. MMA judging, folks— Brian Hemminger (@BrianHemminger) October 20, 2013
You know, when there's ten seconds left why WOULDN'T you just start kneeing the brain stem? Nobody's going to do anything about it.— Lactor: Acid Monster (@AcidicLactor) October 20, 2013
Texas commission rears its head finally. 30-26's are laughable. I thought we were going to have a draw.— Greg Savage (@TheSavageTruth) October 20, 2013
Check out all of MMA Mania's coverage for UFC 166: 'Velasquez vs. Dos Santos 3' here.