Support for Marcos, the son and namesake of the ousted dictator who ruled the Philippines for two decades, remained at 56 percent ahead of next week's ballot, while Robredo, the incumbent vice president, slipped to 23 percent from 24 percent a month ago in the Pulse Asia surveys.

Multi world boxing champion Manny Pacquiao and Manila mayor Francisco Domagoso had 7 percent and 4 percent support respectively. The election takes place on May 9.

The Pulse Asia survey of 2,400 people was conducted between April 16 to 21, which political analyst Temario Rivera said may not have registered the late flurry of support for Robredo, who has drawn crowds of tens of thousands of people in rallies in recent days.

"We might be looking at a situation when surveys cannot fully capture what is actually happening on the ground," Rivera said.

That includes a series of endorsements or late switches of allegiance in favor of Robredo, 57, from mayors, candidates, governors and politicians in the past few weeks, he said.

Marcos, 64, has said he would not let his strong showing in polls distract him from work needed to be done to ensure victory. Read full story

The poll released on Monday showed his running mate, Sara Duterte-Carpio, daughter of incumbent leader Rodrigo Duterte, still the favorite to become vice president, a post elected separately to the president.

Duterte, whose six-year term ends late next month, has not endorsed a presidential candidate, but his political party is backing Marcos. Read full story

More than 67 million Filipinos have registered to vote in the elections, which historically have a high turnout.

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