Naoya Inoue knocked out Nonito Donaire in ruthless fashion on Tuesday in Japan to unify the WBA, WBC and IBF world bantamweight titles.
It took just two rounds for the 29-year-old superstar to knock out his legendary foe in their rematch, after the pair had already shared a sensational 12-round war.
In their first fight in 2019, Inoue had to cross Donaire.
However, they found themselves in an exciting battle which saw the Japanese star undergo the toughest test of his career.
Inoue finally prevailed in the final stages, covering Donaire and winning by unanimous decision.
The epic contest was crowned Fight of the Year 2019.
Two and a half years later, the rematch began in dramatic fashion as Inoue floored Donaire early in the very first round.
A superb right hand from the youngster put the veteran on his back.
He recovered to hear the bell, but the writing was already on the wall.
In round two, Inoue came out firing once more and beat Donaire from pillar to post.
He landed a series of powerful and precise shots that put his opponent on wobbly legs and left him staggering around the ring.
Inoue then flattened Donaire with a massive left hook and referee Michael Griffin immediately called off the contest.
Inoue is now the WBA, WBC and IBF bantamweight champion and will be looking to fight WBO title holder Paul Butler to crown an undisputed champion.
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