LAS VEGAS Sergey Kovalev confirmed Saturday that he'll no longer work with longtime trainer John David Jackson. The former light heavyweight champion called Jackson "a nice guy" during an interview session with reporters at MGM Grand, yet revealed he doesn't feel he learned much from Jackson during their time together. Their parting of ways was expected since Andre Ward stopped Kovalev in the eighth round of their light heavyweight championship rematch June 17 at Mandalay Bay Events Center.
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