Inoue stopped Butler in the 11th round, became the undisputed champion

"Monster" Naoya Inoue (24-0, 21 KOs) unified four bantamweight championship belts by patiently chasing and beating Paul Butler (34-3, 15 KOs), and finally knocked him down with a series of punches and got a stoppage at 1:09 of the eleventh round in the main event of the tournament on Tuesday in Tokyo, Japan.

After the fight, Inoue stated that he planned to move up a weight class and become a champion in his fourth division.