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LAS VEGAS, NV - SEPTEMBER 05: Joe Riggs walks to the Octagon to face Ron Stallings in their middleweight bout during the UFC 191 event inside MGM Grand Garden Arena on September 5, 2015 in Las Vegas, Nevada. (Photo by Brandon Magnus/Zuffa LLC/Zuffa LLC via Getty Images)

LAS VEGAS, NV - SEPTEMBER 05:  Joe Riggs walks to the Octagon to face Ron Stallings in their middleweight bout during the UFC 191 event inside MGM Grand Garden Arena on September 5, 2015 in Las Vegas, Nevada.  (Photo by Brandon Magnus/Zuffa LLC/Zuffa LLC via Getty Images)