Canadian GP: Ayrton Senna, McLaren MP4-6 Honda, leads Alain Prost, Ferrari 642, Gerhard Berger, McLaren MP4-6 Honda, Roberto Moreno, Benetton B191 Ford, Jean Alesi, Ferrari 642, and Nelson Piquet, Benetton B191 Ford.
Ayrton Senna, McLaren MP4-6 Honda, leads Alain Prost, Ferrari 642, Gerhard Berger, McLaren MP4-6 Honda, Roberto Moreno, Benetton B191 Ford, Jean Alesi, Ferrari 642, and Nelson Piquet, Benetton B191 Ford.