Mailza Assis (PP) and Alan Rick (Republicanos) advance to the October 25 runoff after the first round produced a 49.76% to 32.27% split, with Mailza carrying 19 of 22 municipalities but falling just short of an outright win. Recent alliance shifts, including Rio Branco Mayor Alysson Bestene and third-place finisher Tião Bocalom moving toward Mailza, have consolidated support behind the incumbent and narrowed the path for Rick in the capital and interior strongholds. Pre-runoff polling consistently showed a tight contest within single digits, reflecting divided regional bases and undecided voters. Trader pricing across narrow victory brackets signals expectations that coalition consolidation and turnout patterns in the final weeks will determine whether the margin stays under 15 points or widens modestly.