Brazilians vote in presidential election runoff pitting leftist Lula against far-right Bolsonaro

Incumbent president lost in first round to senator and son of convicted ex-president

Brazilians are going to the polls on Sunday in a highly unpredictable runoff in which the leftist president, Luiz Inacio Lula da Silva, is attempting an unprecedented comeback against the far-right senator Flavio Bolsonaro, who won the first-round vote.

Bolsonaro's surprise victory despite not leading most polls made him the favourite three weeks ago, but since then Lula's campaign has gained ground, and the two go into the contest virtually tied.