Flávio Bolsonaro’s status as the Liberal Party’s leading challenger to incumbent President Lula in Brazil’s October 4 first-round presidential election underpins the 70.5% trader-implied probability that he will appear in at least one televised debate by October 3. Campaigning opened on August 16, with major networks scheduling multiple first-round debates, including one on August 23 organized by Bandeirantes and another in mid-September. Recent reporting shows both frontrunners’ teams attended preparatory meetings yet have conditioned participation on the other’s presence, leaving early events without the main contenders while smaller candidates remain confirmed. Traders weigh these dynamics against historical patterns in which opposition nominees typically join later rounds to reach voters, even amid strategic holds, creating the current consensus around eventual participation before the first-round vote.