"Monster" put up a monstrous performance against someone he described as the toughest opponent of his career.

Naoya Inoue dominated in the ring from the opening bell and finished the bout without sweating much with a first-round technical knockout win over British champion Jamie McDonnell to capture the WBA bantamweight title at Ota City General Gymnasium on Friday night.

Inoue (16-0, 14 knockouts) has collected his third world title, all in different weigh classes. He's the fifth Japanese to become a three-division champ.