Gennady Golovkin will be tested by Sergiy Derevyanchenko - don't be surprised if he loses

Gennady Golovkin has packed a lot in. A gold standard career across 391 bouts as an amateur and a pro. Now 37 the question is how much does he have left?  His meeting at Madison Square Garden with Sergiy Derevyanchenko for the vacant IBF middleweight crown will provide the answer.  Derevyanchenko is part of the rich wave of fighters from Ukraine marching on America, career amateurs chasing gold on the professional stage.  While he might not be quite in the class of Vasyl Lomachenko, Oleksandr Usyk and Oleksandr Gvosdyk he was good enough to win 371 of his 390 amateur bouts.  His only defeat as a pro was a split decision loss to Danny Jacobs, who took Golovkin the distance.  Like Golovkin, Derevyanchenko was feared in the amateurs, a technical boxer with destructive power. Though 33, he is still the right side of nature’s clock to push Golovkin to the limit.  I suspect father time is on Golovkin’s case, catching up. No matter how fit and disciplined he is, at this level and a