FILE - In this Sept. 12, 2017, file photo, Gennady Golovkin poses on stage during the fighter arrivals in Las Vegas. Mexico's popular Saul "Canelo" Alvarez squares off Saturday, Sept. 16, against Gennady Golovkin in a long-anticipated middleweight bout as part of the Mexico Independence Day celebrations in Las Vegas. (AP Photo/John Locher, File)