Flávio Bolsonaro’s confirmation as the Liberal Party nominee positions him as the main challenger to incumbent President Lula ahead of the October 4 first-round vote, yet his public statements conditioning debate participation on Lula’s attendance introduce notable uncertainty. Scheduled televised debates, including one on August 23, have extended invitations to leading candidates, aligning with standard electoral practice, but recent campaign strains—including scandals and legal issues surrounding his family—add hesitation among traders. This balance sustains near-even odds around the 51.5% implied probability for no participation. Confirmation of Lula’s involvement or a firm commitment from Flávio Bolsonaro’s team could quickly shift sentiment toward yes, while renewed distancing or scheduling conflicts could reinforce the current lean.