On This Day: Mansell, Prost and Piquet leave Senna behind in title fight | Brief

On 21st September 1986, the Portuguese Grand Prix saw a dramatic turn in the Formula 1 championship as Ayrton Senna's hopes for the title were dashed when he finished in fourth place. His Lotus-Renault ran out of fuel, allowing Nigel Mansell to secure victory, followed by Alain Prost and Nelson Piquet, which resulted in Mansell taking a significant lead in the championship standings.

This race was pivotal in the thrilling 1986 championship battle, with only two rounds remaining after this event. Mansell's win at Estoril not only showcased his driving prowess but also set the stage for the upcoming races in Mexico and Australia, where further drama was anticipated in the title fight.