In his home race at the Paul Ricard circuit near Marseille, Prost took pole and won convincingly, while fellow Frenchman Jean Alesi made his debut for the Tyrrell team, replacing Alboreto due to the team now having Camel sponsorship which conflicted with his personal Marlboro sponsorship.
At this, the halfway point of the championship, Prost's lead over Senna had increased to 20 points; Britain was the 4th consecutive race Senna had retired from- and Prost had won 3 of those 4 races.