Flavio Bolsonaro’s commanding 99% implied probability of finishing first in Santa Catarina reflects consistent regional polling strength in the conservative-leaning South, where recent surveys show him leading President Lula by margins exceeding 30 points in second-round simulations. First-round results on October 4 delivered him a narrow national edge that translated into even larger advantages in Santa Catarina, reinforced by endorsements from defeated center-right candidates and high rejection ratings for Lula in the state. Trader consensus prices in these structural factors plus historical voting patterns favoring PL-aligned candidates in the region. Late developments that could narrow the gap include sharp turnout shifts among undecided voters, major last-minute endorsements, or unexpected national events altering the campaign narrative before the October 25 runoff.