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LAS VEGAS, NV - SEPTEMBER 15: Boxer Canelo Alvarez (L) and WBC, WBA and IBF middleweight champion Gennady Golovkin pose during their official weigh-in at MGM Grand Garden Arena on September 15, 2017 in Las Vegas, Nevada. Golovkin will defend his titles against Alvarez at T-Mobile Arena on September 16 in Las Vegas. (Photo by Ethan Miller/Getty Images)