Takashi Miura beat top-ranked Mexican challenger Edgar Puerta to successfully defend his super featherweight crown for a third time in a WBC world title doubleheader on Saturday.

Miura scored a technical knockout victory in the sixth round at Yokohama International Swimming Pool, as did flyweight champion Roman Gonzalez of Nicaragua in the day's first title fight.

Miura smashed Puerta with a straight left and finished him off before the fight was stopped 2 minutes, 15 seconds into the sixth.

The 30-year-old Miura improved his record to 28 wins (21 knockouts) against two defeats and two draws.

"I'm relieved," said Miura. "I'd like to have knocked (Puerta) down in an earlier round but he was a tough opponent. There are some aspects of my performance that I am not satisfied with so I want to improve."

Gonzalez remained unbeaten as he defeated Rocky Fuentes of the Philippines in his first defense of the flyweight title.

The 27-year-old sent Fuentes to the canvas with a one-two in the sixth and the referee decided Fuentes could not continue.

"My opponent is a very good boxer, too, and I am happy that I could win," said Gonzalez, who has won all 41 of his fights, 35 of them by knockout.

"I used a lot of upper cuts as planned and I think I got some good rights in too."