TOKYO - Japanese boxing superstar Naoya Inoue retained his undisputed super bantamweight world title by unanimous decision in a thrilling 12-round battle with countryman Junto Nakatani in Tokyo on Saturday.

The fighter known as "The Monster" extended his record winning streak in world title matches to 28 consecutive bouts in front of roughly 55,000 at a sold-out Tokyo Dome after the judges scored the contest 116-112, 115-113, 116-112 in his favor.

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