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LONDON, ENGLAND - SEPTEMBER 10: Gennady Golovkin of Kazakhstan in the ring ahead of his fight with Kell Brook of Great Britain for the WBC, IBF & IBO Middleweight titles at The O2 Arena on September 10, 2016 in London, England. (Photo by Leigh Dawney/Getty Images)

LONDON, ENGLAND - SEPTEMBER 10:  Gennady Golovkin of Kazakhstan in the ring ahead of his fight with Kell Brook of Great Britain for the WBC, IBF & IBO Middleweight titles at The O2 Arena on September 10, 2016 in London, England. (Photo by Leigh Dawney/Getty Images)