Brazilians head to the polls on Sunday to elect their next president

Based on the articles provided, here are key points summarizing the upcoming presidential runoff election in Brazil:

• Candidates:
• Luiz Inácio Lula da Silva (leftist incumbent president)
• Flávio Bolsonaro (right-wing senator and son of former President Jair Bolsonaro)

• Current polls show a tight race, with both candidates needing over 50% to win outright.

• Background:
• This is Lula's final electoral battle before turning 81 next week.
• Flávio Bolsonaro unexpectedly outperformed expectations in the first round of voting.

• Key issues:
• Security and crime
• U.S.-Brazil relations
• Social welfare programs

• Potential implications:
• If Bolsonaro wins, it would extend a trend of right-wing victories across Latin America (Chile, Peru, Colombia).
• A Lula victory would keep Brazil in the "leftist" camp along with Mexico.

• Flávio Bolsonaro's campaign focuses on cracking down on crime and freeing his father from prison for alleged coup plotting.

• The election is seen as a choice between continuity under Lula versus change towards a more right-wing, U.S.-aligned direction.

• Voter turnout in the first round was low at 33% of eligible voters abstaining.

In summary, this runoff represents a crucial moment where Brazil could shift significantly to the political right and closer ties with the United States, or maintain its current leftist trajectory under Lula. The outcome will have implications not just for Brazil but for regional politics in Latin America as well.