Nonito Donaire (21-1, 14 knockouts) successfully defended his IBF flyweight title with an impressive fourth-round KO of undefeated Raul Martinez (24-1, 14 KOs) in the main event of a Top Rank-promoted card in Manila, Philippines on Saturday.

Donaire dominated the entire fight, boxing from the outside and pot-shotting Martinez at will. Donarie dropped Martinez twice in the first round, once in the second round and a final time in the fourth before referee Pete Podgorski waved the bout off.

In the co-featured bout, former 108-pound titleholder Brian Viloria (25-2, 15 KOs) won his second major title by knocking out longtime IBF beltholder Ulises Solis (28-2, 20 KOs) in the 11th round of a brisk and competitive fight.

Viloria repeatedly rocked Solis in the early parts of the majority of rounds, but the well-schooled Mexican titleholder never stopped coming forward, throwing punches and trying to win.

However, the veteran marched into a right cross that crumpled him to the canvas where he remained for the 10 count in the 11th round.