On this Day in Formula 1: Mansell seals Williams crown, Piastri crumbles in Baku

The key early moment came at the 1986 Portuguese Grand Prix. Mansell won comfortably for Williams after championship rival Ayrton Senna ran out of fuel on the final lap because of an incorrect fuel calculation. Alain Prost inherited second for McLaren, with Nelson Piquet third in the second Williams