Mansell, Piquet and Prost were engaged in a gripping battle for the lead, separated by just two seconds. On lap 19, Piquet spun and Prost passed him for second. Meanwhile, Senna was holding onto a creditable fourth place. On lap 30, Piquet pitted for new tyres, followed two laps later by Senna. Meanwhile, Thierry Boutsen (Benetton B187) retired with electrical failure. Both Mansell and Prost came in for new tyres on lap 36, handing the lead to Piquet. Mansell completed his stop and closed rapidly on Piquet, breaking fastest lap records. On lap 46, at the Le Beausset corner, Piquet made an error and Mansell passed him on the inside to take a lead he would not lose. On lap 65 Piquet made a second stop which went wrong when the engine stalled, delaying him by an additional eight seconds. After exiting the pits, he caught and passed Prost (who was dealing with an electrical problem) on lap 67.