Recent first-round results on October 4 sent Brazil’s presidential race to an October 25 runoff, with Senator Flávio Bolsonaro edging President Luiz Inácio Lula da Silva 47% to 45% and advancing as the narrow favorite. Pre-election polls had shown a statistical tie in runoff scenarios, but Bolsonaro exceeded expectations amid economic unease, right-wing congressional gains, and migration of conservative votes from eliminated candidates. Lula, seeking a fourth non-consecutive term, framed the contest as a choice between democracy and its alternatives, while Bolsonaro positioned himself as the vehicle for political change. Traders assess the three-week campaign window, undecided voters, and potential endorsements as key variables that could shift the tight implied probabilities reflected in current pricing.