MANILA, Philippines -- Filipino boxer Nonito Donaire knocked down American challenger Raul Martinez four times Sunday to win by technical knockout and retain his International Boxing Federation flyweight title.
Donaire (21-1) pummelled the previously undefeated Martinez (24-1) with rapid punches to the head, sending him to the canvas a fourth time before the referee stopped the fight 2:42 into the fourth round at Manila's Araneta Coliseum.
Donaire worked early on Martinez, flooring him twice in the first round and once in the second.
In the fourth round, Martinez took a sharp left uppercut and fell backward, prompting referee Pete Podgorski to stop the match.
The Filipino crowd roared, chanting Donaire's name, and former Philippine president Joseph Estrada, who sat in the ringside, congratulated Donaire.
In a separate bout, America's Brian Viloria knocked out Ulises Solis of Mexico with a powerful right to the jaw in the 11th round to become the new IBF light flyweight champion.
The Hawaii-born Viloria (25-2), who is of Philippine ancestry, raised his arms in victory and shed tears as Solis lay on the canvas.
"He's not a Filipino executioner no more. It ended today," the 28-year-old Viloria said of Solis (28-2-2), who has defeated three Filipino fighters in the last two years.