However, he said he would not proclaim himself the victor until it was official.
"I am not there until I am there, and that is the when last vote is counted and you are declared a winner. At this time it would be presumptuous of me," he said.
Roxas had 22.39 percent of the vote, while Senator Grace Poe trailed closely in third, according to the PPCRV.
In the Philippines, a winner is decided simply by whomever gets the most votes.
Duterte, a pugnacious 71-year-old, surged from outsider to the top of surveys with cuss-filled vows to kill tens of thousands of criminals, threats to establish one-man rule if lawmakers disobeyed him and promises to embrace communist rebels.
He also boasted repeatedly about his Viagra-fuelled affairs, while promising voters his mistresses would not cost a lot because he kept them in cheap boarding houses and took them to short-stay hotels for sex.
Duterte caused further disgust in international diplomatic circles with a joke that he wanted to rape a "beautiful" Australian missionary who was killed in a 1989 Philippine prison riot, and by calling the pope a "son of a whore".
In his final rally on Saturday, Duterte repeated to tens of thousands of cheering fans his plans to end crime within six months of starting his presidency.
However, his critics said he had done little to change an economic model that favours an extraordinarily small number of families that control nearly all key industries, and has led to one of Asia's biggest rich-poor divides.
Source: Yahoo News
Source: Yahoo News
