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Rousseff won the first round of voting on Oct. 5 with 41.6% of the votes, while Neves garnered 33.6%.
The incumbent president will face centrist Social Democracy Party candidate Aécio Neves in the second round on October 26.
Brazil is the third BRICS member to go to the polls this year after India and South Africa.
Support for Marina Silva appears to be dropping as Rousseff has stepped up attacks on the environmentalist.
If Rousseff has to face a run-off with nearest rival Silva, she would win by 49-41 per cent, the poll showed.
The Brazilian President pointed towards serious risks of paralysis and inaction of the UN Security Council.
The largest country in South America goes for presidential polls on October 5.
A FIFA study noted greater risk-taking by players and the growing role of goalkeepers to determine the outcome of matches.
Consumer confidence is dwindling, some economists say, as industry appears to slow down.
The GDP data could dampen the re-election campaign of President Dilma Rousseff.