Latest polls suggest Lula’s lead over Bolsonaro is narrowing, with neither candidate likely to win outright on Sunday.

Brazilian President Luiz Inacio Lula da Silva and right-wing Senator Flavio Bolsonaro have wrapped up their election campaigns, each voicing confidence in victory ahead of Sunday’s tightly contested first-round presidential vote.

Lula, 80, closed his re-election bid on Saturday with a march through Sao Paulo, Brazil’s economic powerhouse, drawing what his campaign called a record crowd for a closing rally.

“Tomorrow, we’re going to win the elections in the first round,” he told supporters, describing Sunday’s vote as a choice between “democracy and barbarism” and promising to “defeat the far right”.

He has also framed the election as a test of Brazil’s sovereignty, warning against “meddling” by Washington.

Bolsonaro led a motorcycle caravan through towns in Sao Paulo state, echoing the campaign style of his father, before rallying later in Rio de Janeiro. “I am convinced that everything is in place for us to win this election in the first round,” he said.

The 45-year-old is the son of former President Jair Bolsonaro, a close ally of US President Donald Trump. The former leader, 71, is serving a 27-year prison sentence for attempting to overturn his 2022 election loss to Lula.

The younger Bolsonaro was photographed at his rally holding a portrait of his father.

Trump has not formally endorsed Bolsonaro but has said he is watching the election “very closely”, a level of US interest that has become a flashpoint in the campaign.

Lula’s supporters have seized on it as evidence Washington is trying to meddle in the elections, while some Bolsonaro supporters, frustrated by the cost of living, say they would welcome US pressure if it helped force change at home.

Polls released on Saturday suggested Lula was still ahead but his lead was narrowing, with neither candidate likely to win outright on Sunday. Such a result would send the race to a run-off on October 25 between the two frontrunners, a contest polls suggest would also be close.

It is a far tighter race than Lula’s last victory in 2022, when he beat the elder Bolsonaro by less than two percentage points.

Meanwhile, the Bolsonaro campaign has faced scrutiny over a film-funding scandal. Flavio Bolsonaro is under investigation over financing for Dark Horse, a biopic about his father, bankrolled by a jailed banker tied to one of Brazil’s biggest financial scandals.

Brazil’s Supreme Court authorised federal police in April to investigate whether Flavio Bolsonaro made defamatory statements about Lula.

Bolsonaro has pledged to seek his father’s release from prison if elected, and has echoed his father’s unsubstantiated claims questioning the reliability of Brazil’s electronic voting system, which analysts say could be laying the groundwork to contest the result if he loses.

Beyond the presidency, Brazil’s nearly 160 million registered voters will also choose lawmakers, governors and senators on Sunday.

Right-wing candidates have gained ground in Latin America in recent months.