JDS says “Cain Velasquez is going to sleep!”

Outside of the cage, former UFC heavyweight champion Junior dos

Santos is one of the most affable people you could every hope to

encounter. All smiles and giggles, the 29-year-old for Salvador,

Bahia, Brazil is the embodiment of what you would like all

professional athletes to be when they’re interacting with

fans and media.

But when the cage door closes, the smile turns into a scowl, the

giggles replaced with an icy stare, and instead of offering a hug

or a handshake, “Cigano” strides to the center of the

cage and throws down the gauntlet.

target="_blank">Saturday night at UFC 166, the nicest knockout

artist in the UFC will look to once again claim championship gold

as he squares off with Cain Velasquez for the third time in two

years. The two have traded victories – and the UFC

heavyweight title – in their first two encounters, and this

weekend’s third fight promises to be every bit as griping and

exciting.

Speaking with UFC on FOX correspondent Ariel Helwani following

Friday’s weigh-ins, the 16-2 challenger gave his prediction

on how Saturday’s championship main event will play out.

Check out the clip and be sure to stay tuned to FoxSports.com

for complete coverage of UFC 166.