With heavyweights on the main stage at UFC 166: Velasquez Vs Dos Santos III, UFC Commentator Joe Rogan took a few minutes to run down the top eight heavyweight knockouts of all time. One thing is clear when heavyweights get in the octagon and start throwing punches with four ounce gloves, anything can happen.

UFC 166: Velasquez Vs Dos Santos III takes place on October 19 at the Toyota Center in Houston, Texas. The main event will be the trilogy fight between current Heavyweight Champion Cain Velasquez and Former UFC Heavyweight Champion Junior dos Santos. In the co main event, Strikeforce Heavyweight Grand Prix winner Daniel Cormier will be taking on Roy Nelson.

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