UFC 155 takes place on Saturday night from the MGM Grand Garden Arena in Las Vegas, Nevada, and will see champion Junior Dos Santos take on challenger Cain Velasquez. All the action starts from 7 p.m. ET and can be watched online through free live stream (details below).
Velasquez and Dos Santos have of course faced off before in the UFC's first event on network TV. In that previous clash Do Santos won through with a first round knock out victory.
However, since then both fighters have arguably improved and especially Velasquez will believe he is ready to claim revenge over his old adversary tonight.
Other fights taking place on Saturday night preceding the main event include; Miller vs Lauzon, Boetsch vs Philippou, Yushin Okami vs Alan Belcher; Chris Leben vs Derek Brunson.
Those fights will be taking place on the special UFC 155 pay per view special.
In addition, the following fights will be taking place on FX as preliminaries; Brad Pickett vs Eddie Wineland; Erik Perez vs Byron Bloodworth; Melvin Guillard vs Jamie Varner; Michael Johnson vs Myles Jury.
In the Facebook preliminaries there were also three undercard fights including Phil de Fries vs Todd Duffee; Leonard Garcia vs Max Holloway; Chris Cariaso vs John Moraga.
In those John Morago already came from behind to win by claiming a submission from Chris Cariaso after getting him in a guillotine choke in the third round.
In other action Max Holloway also claimed a split decision over Leonard Garcia, although it was a close match and some have called the decision slightly controversial.
Also Todd Duffee made a successful comeback to the UFC by knocking out Phil de Fries just after two minutes of the fight.
UFC 155 and Junior Dos Santos vs Cain Velasquez will take place later on Saturday night - that fight and all the undercard match ups can be watched online through free live stream by clicking here.