(CNN) -- Egypt's landmark presidential election looks set to go to a run-off vote in which Muslim Brotherhood candidate Mohamed Morsi could face former regime figure Ahmed Shafik, according to partial results reported Friday. Ballots are still being counted, and the final results of the first round are due Tuesday. Egyptian newspaper Al Ahram Online gave Morsi 26.48% of the vote with results in from 25 of 27 provinces, with Shafik, who was ousted President Hosni Mubarak's last prime minister, close behind with 24.74% of the vote and leftist Hamdeen Sabahy in third with about 20%. The partial results put Abdelmonen Abol Fotoh, a moderate Islamist running as an independent, and Amre Moussa, who previously served as foreign minister and headed the Arab League, in fourth and fifth places, respectively, Al Ahram Online reported.
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NEW: Muslim Brotherhood candidate Mohamed Morsi leads with most results in
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Ahmed Shafik, a Mubarak ally, is running a close second, according to local media reports
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Morsi and Shafik are highly polarizing candidates for many Egyptians, an analyst says
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The final results of the first round of elections are due Tuesday
Shafik, a former air force officer with close ties to Egypt's powerful military, is seen as representing the interests of the old guard -- those who lost out when President @placeholder was ousted.