Casimero’s power immediately changed the fight. A left hook sent Nery crashing to the canvas less than 30 seconds into the opening round. Two more knockdowns followed before the round was over, leaving Nery badly hurt and facing an uphill battle.

The punishment continued in the second and third rounds as Casimero repeatedly beat Nery to the punch. Another knockdown in the second and a fifth trip to the canvas in the third left the former world champion running out of answers.

Nery entered the fight carrying questions after missing weight, coming in at 127.4 pounds compared to Casimero’s 123.4 pounds. Any advantage from the extra weight never materialized as Casimero controlled the action with superior timing, sharper combinations and the heavier punches.

The end came early in the fourth round.

After targeting the body, Casimero connected with a hard combination that sent Nery down for the sixth time. Referee Nobuto Ikehara immediately halted the contest, ending the one-sided affair after just 42 seconds of the round.

The victory improved Casimero’s record to 36-5-1 and marked one of the most emphatic wins of his recent career. At 37 years old, the Filipino veteran showed he still possesses the power and aggression that made him a world champion in three weight classes.

Following the victory, Casimero renewed his pursuit of undisputed super bantamweight champion Naoya Inoue, calling for a fight that has been discussed for years but never finalized.

Whether that opportunity materializes remains to be seen, but Casimero made one thing clear in Japan: he remains a dangerous contender capable of changing a fight with a single punch.