Brazilian Vote to Choose Between President Jair Bolsonaro, Leftist Rival

SÃO PAULO—Brazilians cast their ballots Sunday in one of the most tense presidential elections in decades, with President Jair Bolsonaro forecast in polls to lose to his predecessor, Luiz Inácio Lula da Silva, in a vote that would consolidate a shift to the left in South America.

Mr. da Silva, a former president and longtime standard-bearer for the Latin American left who was jailed for corruption in 2018 and 2019, was expected to get at least 50% of the vote, according to Datafolha and Ipec polls late Saturday, enough to clinch a first-round victory.