Chris Weidman knocks down Anderson Silva with a left hook...

Chris Weidman knocks down Anderson Silva with a left hook to the chin during the second round of their championship fight at UFC 162. (July 6, 2013) Credit: Newsday/Mario Gonzalez

Watch the UFC 168 world tour stop in Las Vegas as Long Island's Chris Weidman, the champion, and Anderson Silva, the former champion, meet the media.

The live stream starts at 2 p.m. ET Tuesday.

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