Japan’s Koki Kameda knocked out Mexican challenger Mario Macias in the fourth round to defend his World Boxing Association bantamweight title on Wednesday. The knockout came two minutes four seconds into the stanza when Kameda fired four punches to the stomach to send Macias onto the floor for the third time in the bout. “I feel I was able to hit powerful punches. I’m in good form today. It’s because this is my home town,” said Kameda, who floored Macias with a left hook in the first and third rounds. It was Kameda’s third defence since winning the vacant title when he beat Alexander Munoz of Venezuela in December last year, stretching his record to 27 wins, including 17 KOs, against one defeat. Kameda is the eldest of a trio of boxing brothers who have bad-boy images in the media and among boxing fans.