UFC 166 Live Stream: Watch Online Cain Velasquez vs Junior dos Santos 3 (Fight Card, UFC.TV PPV Start Time)

UFC 166 takes place on Saturday night in one of the most eagerly anticipated Ultimate Fighting Championship match ups of the year, with the main event being Cain Velasquez vs Junior dos Santos. Online preliminaries will start at 6 p.m. ET, with regular preliminaries starting from 8 p.m. ET. The main event card will start from 10 p.m. ET – and the main event fight card can be seen below. UFC 166 can be watched on UFC pay-per-view (PPV) or can be watched online through live stream (details below).

(Photo: Reuters/Mohammed Salem)A view of the Ultimate Fighting Championship (UFC) octagon during the UFC tournament in this file photo.

Tonight's main event, Cain Velasquez and Junior dos Santos, will be fighting it out to try and prove who is the best in their third match up, which has been billed as a decider between the pair. The two top fighters have of course taken one a piece in their previous two fights, and the winner tonight is touted by some to be fast-tracked to become the best heavyweight fighter in MMA history.

In the first meeting between Dos Santos and Velasquez, Dos Santos knocked Velasquez out in a dramatic first round.

However, in their second clash, Velasquez dominated from the opening and looked far the superior fighter in the rematch.

These two are clearly the best heavyweights in the world, and whoever wins tonight will have claim to being the number 1.

Even though UFC 166 will clearly be focused on this main fight, there are a number of other top fights in the light heavyweight and lightweight divisions.

Daniel Cormier will be taking on Roy Nelson, and although Cormier is fighting at heavyweight tonight at UFC 166, if he can win well tonight then he could be put on the track for a light heavyweight title shot.

Gilbert Melendez will also be featuring tonight, in his first fight since his controversial loss to then-champ, Benson Henderson. He will be taking on former title challenger Diego Sanchez.

Here is the full fight card for UFC 166:

Online Prelims: 6 p.m. ET

TJ Waldburger vs. Adlan Amagov
Tony Ferguson vs. Mike Rio
Jeremy Larsen vs. Andre Fili
Dustin Pague vs. Kyoji Horiguchi
Online prelims will be shown on UFC.com.

Fox Sports 1 Prelims: 8 p.m. ET

Tim Boetsch vs. CB Dollaway
Nate Marquardt vs. Hector Lombard
Sarah Kaufman vs. Jessica Eye
George Sotiropoulos vs. KJ Noons

UFC 166 Pay-Per-View: 10 p.m. ET

Cain Velasquez vs. Junior dos Santos
Daniel Cormier vs. Roy Nelson
Gilbert Melendez vs. Diego Sanchez
Gabriel Gonzaga vs. Shawn Jordan
John Dodson vs. Darrell Montague

UFC 166 can be watched on TV on UFC PPV, or the action can be watched online through UFC TV live stream by clicking here.