**Flávio Bolsonaro leads trader expectations for second place in Brazil’s October 4 first-round presidential vote due to his consistent positioning as the primary challenger in a polarized race against incumbent Luiz Inácio Lula da Silva.** Recent national polls from Datafolha, Quaest, AtlasIntel, and others show Lula narrowly ahead in first-round voting intentions (typically 39–45%) while Flávio trails closely (34–42%), with both far ahead of Augusto Cury, Ronaldo Caiado, Renan Santos, and remaining candidates in single digits or lower. This pattern supports the view that the top two will advance to an October 25 runoff. Key factors include Flávio’s inheritance of his father Jair Bolsonaro’s Liberal Party base after the former president’s ineligibility, ongoing campaign focus on security, spending cuts, and institutional issues, and Lula’s efforts to highlight social programs amid economic pressures. Late-September surveys remain within margins of error, with a Globo debate and final campaign days as potential near-term movers before voting.