Bahrain International Circuit. By Gabriel Araujo SAO PAULO, Nov 8 (Reuters) - Mercedes secured their ninth Formula One constructors' world championship and completed a title double on Sunday in a wet Sao Paulo Grand Prix won. Mercedes returned to the top of Formula 1 after clinching the 2026 Constructors’ Championship at the São Paulo Grand Prix on Sunday. George Russell finished fourth and Kimi Antonelli fifth.