Recent polling from early May shows incumbent Luiz Inácio Lula da Silva with first-round support near 39 percent and Flávio Bolsonaro at 33–37 percent, while smaller candidates split the remaining votes in a polarized field. Brazil’s runoff system requires more than 50 percent of valid votes on October 4 for an outright win, and the persistent fragmentation plus high mutual rejection between leading contenders has blocked any consolidation that could push one candidate over that threshold. Traders therefore assign an 86 percent implied probability to no outright victory, consistent with historical patterns where runoff rounds have been needed in most recent cycles absent major last-minute shifts.