front leading. Mansell was down in fourth. Berger, Senna and Mansell quickly overtook Martini and Mansell closed on Senna. However, as driving a car in reverse in the pit lane was expressly forbidden (the pit crew may legally push a car backwards), Mansell was given the black disqualification flag. At the start of lap 48, approaching Turn 1 even while the black flag was being waved at him Mansell tried to overtake Senna, the cars collided and both drivers were out. This damaged Senna's title chances, especially since rival Alain Prost came in second place. The race was won by Berger ahead of Prost, with Stefan Johansson a surprising third in the underfunded Onyx; the Swede did not make a pit-stop at any stage of the race and was initially on course for fifth place until both Williams-Renault entries were pulled out with overheating issues. Race classification Championship standings after the race Drivers' Championship standings Constructors' Championship standings References Portuguese Grand Prix Portuguese Grand Prix Grand Prix Portuguese Grand Prix