Brazilians cast their votes on Sunday in the first round of their country's most polarized election in decades, with leftist Luiz Inácio Lula da Silva expected to beat right-wing incumbent Jair Bolsonaro.

While casting her vote at a station in Sao Paulo, voter Valeria Lope said she is hoping for renewal and for things to change.

Meanwhile, Wander Souza said he is not satisfied with how things are in the country but reiterated that doesn't mean he'll vote for Lula.

Most opinion polls have shown Lula with a solid lead for months, but Bolsonaro has signalled he may refuse to accept defeat, stoking fears of institutional crisis or post-election violence.

Most surveys favour Lula, who was president from 2003 to 2010, by 10-15 percentage points. If he wins more than 50 per cent of valid votes, which several pollsters show within reach, that would clinch an outright victory — foregoing a second-round vote.

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