Mark "Magnifico" Magsayo settled for a wide unanimous decision victory after outlasting tough Mexican challenge Ramiro Robles in the undercard of Pinoy Pride 38 on Saturday at the StubHub Center in Carson, California.

The 21-year-old Magsayo won with scores of 119-107, 118-108, 120-106 to improve to 15-0 in his young career. He retained the WBO International featherweight championship with the victory.

It was a hard-earned win for Magsayo, who started out strong and peppered his Mexican foe with powerful body shots, only to tire out in the middle rounds as Robles proved to be a tough nut to crack. He got his second wind, however, and was never in trouble even as Robles kept pushing forward.

(READ: Pinoy fighters make weight for Pinoy Pride 38 in California)

Magsayo registered a knockdown in the second round, landing a left straight that sent Robles to the canvas. The Mexican beat the count, however, and showed no ill effects as he tried to put pressure on the young Filipino.

In the seventh round, Magsayo sent Robles to the canvas once more, this time with a body shot. Again, however, Robles beat the count.

However, the knockdown seemed to have given Magsayo renewed energy, and the Filipino powered through the final five rounds, often unleashing unanswered flurries of punches that Robles could not answer.

Robles, who came in as a late replacement, lost for the sixth time in his boxing career.

(For more sports coverage, visit the ABS-CBN Sports website.)