Donaire, the 26-year-old Filipino who vacated his IBF flyweight title to move up in weight, improved to 22-1 with his 21st consecutive victory.
Judge Max De Luca scored the fight 117-111, Duane Ford had it 115-113, and Jerry Roth called it 116-112.
“I’m here to give honor to my country,” said Donaire, cheered on by a large Filipino crowd. “We are great fighters. I came here to represent and fight with all of my heart.”