MANILA - Administration presidential candidate Mar Roxas said he was confident he could beat tough-talking frontrunner Rodrigo Duterte in what he described as a battle between good and evil.

Roxas told supporters he was pressing on with his candidacy after Sen. Grace Poe declined his offer to unite and stop the Davao City mayor from placing the entire country under an iron-fisted rule.

"Kumpiyansa tayo na mananalo tayo. Yung momentum ng mga tao na ngayon pa lang pumipili na, yung mga undecided pabor sa atin," Roxas said hours before his final campaign rally Saturday night.

Duterte has led by over 10 points over Roxas and Poe, who were statistically tied for second place in the last surveys before Monday's vote.

The maverick 71-year-old mayor's promise to kill all criminals and shut down Congress if he is impeached has unnerved investors. Stocks closed lower for the third straight week on Friday.

He has also stirred firestorms of criticism for cursing at Pope Francis, a revered figure in the predominantly Catholic country, and joking about the rape of an Australian missionary.

"Yan ang dalawang pwersa na naglalaban sa Lunes. Tiwala ako na ang mga kababayan, pipiliin ang pwersa ng kabutihan, pwersa ng malinis na pamumuno," said Roxas.

Roxas said Poe "shut the door" on his offer to discuss a possible alliance.

"Hindi ba mahalaga na pag-usapan natin ang pinakamalaking banta sa demokrasya? Hindi ba mahalagang pag-usapan ang paghina ng piso? Hindi ba mahalagang pag-usapan o tingnan muna natin kung ano ang mangyayari sa ating mga investments?" he said.

President Benigno Aquino III, who steps down on June 30 had also called on an alliance among Duterte's rivals, after warning in campaign hustings that the mayor had the makings of a dictator.

Tens of thousands of supporters of Duterte, Roxas, Poe and Vice President Jejomar Binay were scheduled to shut down different parts of the capital on Saturday, the last day of the 90-day campaign, with their respective final rallies or “Miting de Avance.”