Counting continued Tuesday in Peru's presidential run-off, with the front-runner maintaining a slight lead as the slow process of evaluating votes from Peruvians living abroad dragged on.
With 96 per cent of the votes counted, liberal economist Pedro Pablo Kuczynski, 77, was ahead with 50.16 per cent, with right-wing populist Keiko Fujimori, 41, at 49.84 per cent, according to electoral officials.
The gap between the two has now shrunk from 103,000 the previous day to just 53,000 votes.
The counting of votes cast in Sunday's run-off could last until Friday, with the 900,000 Peruvians living outside the country who were eligible to vote set to decide the final outcome.
Peru's electoral authority ONPE has drawn criticism for its ballot-counting system, which requires a physical count that has markedly slowed the process.
In the first round of voting in April, Fujimori, leader of the rightist Popular Force Party and the daughter of the country's imprisoned former president, Alberto Fujimori, won 40 per cent of votes to Kuczynski's 21 per cent.
Some 23 million people had been eligible to vote for a successor to outgoing president Ollanta Humala.