Gennady Golovkin, left, connects with a left to Canelo Alvarez during a middleweight title fight in Las Vegas in September 2017. 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.
Gennady Golovkin, left, connects with a left to Canelo Alvarez during a middleweight title fight in Las Vegas in September 2017. 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. John Locher AP file
Gennady Golovkin, left, connects with a left to Canelo Alvarez during a middleweight title fight in Las Vegas in September 2017. 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. John Locher AP file