The Shillong Times. 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. 10 -- McLaren driver Lando Norris was so excited after winning Sunday's rainy Sao Paulo Grand Prix at Interlagos that his usual Champagne celebration went awry, while Mercedes.