Japanese boxing superstar Naoya Inoue comfortably retained the undisputed super bantamweight world championship Friday with a fourth-round knockout of South Korea's Kim Ye Joon.The 31-year-old power puncher, known by the nickname "Monster," looked in control from the outset at Tokyo's Ariake Arena against Kim, who stepped in as a late replacement for injured Australian challenger Sam Goodman.Inoue inflicted early damage when he caught Kim below the eye with a right jab in the second, necessitating treatment for the South Korean between rounds.Kim looked to answer in the third and had succes…READ FULL ARTICLE