NEW YORK Daniel Jacobs might be the only boxer in the world with inside knowledge of Gennady Golovkin and Sergiy Derevyanchenko. Jacobs gave Golovkin perhaps the most difficult fight of his career in March 2017 at Madison Square Garden. Derevyanchenko, who's trained and managed by the same men as Jacobs, was one of Jacobs' primary sparring partners for the Golovkin fight.
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