The first start was aborted when the Rial-Ford of Andrea de Cesaris stalled on the grid. The second start was aborted after Derek Warwick stalled his Arrows A10 and was hit by de Cesaris, with Luis Pérez-Sala (Minardi) and Satoru Nakajima (Lotus). Ayrton Senna led off at the third start, to the delight of the Portuguese crowd. At the start of lap 2, Alain Prost pulled out of Senna's slipstream to pass him. Senna moved violently over on Prost and forced him towards the pit wall at over . The Frenchman nonetheless maintained his will to pass the Brazilian, not lifting off the throttle, and passed Senna into the first corner.