Detroit GP: Ayrton Senna, Lotus 98T Renault, leads Nigel Mansell, Williams FW11 Honda, René Arnoux, Ligier JS27 Renault, Nelson Piquet, Williams FW11 Honda, Stefan Johansson, Ferrari F1/86, and Jacques Laffite, Ligier JS27 Renault.
Ayrton Senna, Lotus 98T Renault, leads Nigel Mansell, Williams FW11 Honda, René Arnoux, Ligier JS27 Renault, Nelson Piquet, Williams FW11 Honda, Stefan Johansson, Ferrari F1/86, and Jacques Laffite, Ligier JS27 Renault.