A third of polling stations have been counted after polling day on Wednesday.
At midday SODELPA had an eight percent lead over Frank Bainimarama's FijiFirst, with two thirds of polling stations still to be added to the national tally.
The National Results Centre is entering data as result sheets are transported in from around the country.
Provisional results from the polling stations indicated a slim victory for Mr Bainimarama.
The elections authorities have urged people not to heed false reports a second count is being conducted.
Opposition parties have met with the international observer group to express concern about parts of the election process.
About 8000 voters are due to vote again tomorrow after their polling stations were rained out.