Japanese boxing star Naoya Inoue overcame a gutsy performance by American Ramon Cardenas to retain the undisputed super bantamweight world championship Sunday via an eighth-round technical knockout.The four-division world champion known as "Monster" improved to 30-0 with 27 KOs after bouncing back from an early knockdown at the hands of World Boxing Association No. 1 challenger Cardenas at T-Mobile Arena in Las Vegas.Cardenas stunned Inoue and energized the crowd by landing a left hook that sent the overwhelming favorite to the canvas at the end of the second round.The knockdown appeared to…READ FULL ARTICLE