Detroit Grand Prix VI
The entry was unchanged from the field that had raced at Monaco three weeks earlier and as usual the battle for pole position was between the Honda-powered cars with Nigel Mansell fastest on this occasion with his Williams. Just behind him was Ayrton Senna's Lotus and Nelson Piquet's Williams. There was then a big gap back to Thierry Boutsen's Benetton-Ford, Alain Prost's McLaren-TAG, Eddie Cheever's Arrows-Megatron and Michele Alboreto's Ferrari. The top 10 was completed by Teo Fabi (Benetton), Riccardo Patrese (Brabham-BMW) and Derek Warwick in the second Arrows.
Mansell took the lead at the start and began to pull away from Senna while behind in the midfield Stefan Johansson (McLaren) damaged a front wing on the back of Warwick's Arrows and Satoru Nakajima (Lotus-Honda) crashed into the back of Ivan Capelli's Leyton House March and then managed to collide with Adrián Campos's Minardi at the next corner.
Behind the two front-runners Piquet had trouble keeping Cheever behind him and eventually gave himself a puncture when he tapped a wheel and had to pit for new tyres. Cheever then had to fight to hold off Fabi and on lap seven the Benetton driver tried to pass and made a mess of it and ended up removing the nose of his car. Both drivers pitted, Fabi to retire and Cheever for new tyres. He rejoined at the back. This left Alboreto third ahead of Boutsen and Prost and the only change in the next few laps was as Prost moved up ahead of the Benetton. Alboreto went out with gearbox failure and so Prost was third as the pit stops approached. During the stops Mansell had a wheel nut stick on his car and lost 10 seconds and that meant that Senna went into the lead with Mansell second, Prost third and Piquet, who had charged up through the field in fourth. Nelson continued his charge and overtook Prost and closed on Mansell, who was suffering from leg cramps. He eventually fell behind the Brazilian, Prost and Gerhard Berger (Ferrari).
Senna won at his ease with Piquet second and Prost third. The remaining points went to Berger, Mansell and the recovering Cheever.