Tarcísio de Freitas, the incumbent Republicanos governor, holds a commanding lead in São Paulo’s October 4 gubernatorial race, supported by recent Quaest polling showing 42% first-round support against Fernando Haddad’s 27%. His advantage has widened slightly since August, driven by gains among independent voters and limited traction for smaller candidates. In second-round simulations, Tarcísio maintains a double-digit edge. Traders price his re-election probability near certainty due to incumbency strength, weak opposition fragmentation, and the absence of viable challengers capable of forcing a runoff or shifting momentum. Late developments such as major scandals, health issues, or sharp turnout changes could still alter outcomes before voting concludes.