Filipino champion Nonito Donaire defended his world super bantamweight titles by stopping Toshiaki Nishioka in the ninth round Saturday, handing the Japanese boxer his first defeat in eight years.

The 29-year-old Donaire knocked Nishioka down for the second time in the fight at 1:54 of the ninth round. Nishioka got up but his corner stepped in to stop the fight.

With the stoppage Donaire (30-1, 19 KOs) retained his WBO and IBF super bantamweight titles and extended his own win streak to 29 contests.

"When you engage you open up," Donaire said. "I can pick him apart and then the demolition man comes in to knock him out."

The fight ended when Nishioka (39-5-3, 24 KOs) walked into a straight right hand from Donaire at the Home Depot Center stadium in Los Angles.

Nishioka also went down with a minute left in the sixth round after being hit with two successive left hands inside.

Donaire dominated the fight, keeping Nishioka at a distance with left jabs and right hands to the body.

In February, Donaire captured the vacant WBO 122-pound (55kg) title, winning a gritty split-decision battle over former world champion Wilfredo Vazquez. Five months later, he added the IBF title with a unanimous decision over Jeffrey Mathebula.

Donaire had won his previous three fights on points, so was pleased to stop his opponent. "I got the guy that I thought was best in the division. Everybody is free fall. Let's go," said Donaire.

Nishioka had been unbeaten for 16 contests going into the fight and the veteran 36-year-old from Tokyo had successfully defended the WBC 122-pound title seven times between 2009 and 2011.

Nishioka had not lost by knockout since the second fight of his career in 1995 and had not lost any contest since Thai star Veeraphol Sahaprom beat him in 2004.