FILE - In this Sept. 17, 2017 file photo shows Gennady Golovkin, left, connects with a left to Canelo Alvarez during a middleweight title fight in Las Vegas. Golovkin is growing frustrated with boxing's sanctioning bodies while he struggles to find a replacement opponent for Canelo Alvarez on May 5. The unbeaten middleweight champion's rematch with Alvarez in Las Vegas fell through after the Mexican star failed a doping test in February and finally withdrew from the bout last week.(AP Photo/John Locher, File)
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