Kathy Duva, promoter for former light heavyweight champion Sergey Kovalev, believes her boxer's issues with stamina is now a thing of the past. Kovalev (32-3-1, 28 KOs) was at one-time regarded as one of the most feared fighters in the sport. But in recent years, Kovalev has lost three of his last five fights - and two of those defeats have been by knockout.
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