Detroit GP: Jacques Laffite, Williams FW08C Ford, leads Danny Sullivan, Tyrrell 011 Ford, Riccardo Patrese, Brabham BT52 BMW, Niki Lauda, McLaren MP4-1C Ford, Jean-Pierre Jarier, Ligier JS21 Ford, Manfred Winkelhock, ATS D6 BMW, Bruno Giacomelli, Toleman TG183B Hart, John Watson, McLaren MP4-1C Ford, Mauro Baldi, Alfa Romeo 183T, Piercarlo Ghinzani, Osella FA1D Ford, Johnny Cecotto, Theodore N183 Ford, and Raul Boesel, Ligier JS21 Ford.
Jacques Laffite, Williams FW08C Ford, leads Danny Sullivan, Tyrrell 011 Ford, Riccardo Patrese, Brabham BT52 BMW, Niki Lauda, McLaren MP4-1C Ford, Jean-Pierre Jarier, Ligier JS21 Ford, Manfred Winkelhock, ATS D6 BMW, Bruno Giacomelli, Toleman TG183B Hart, John Watson, McLaren MP4-1C Ford, Mauro Baldi, Alfa Romeo 183T, Piercarlo Ghinzani, Osella FA1D Ford, Johnny Cecotto, Theodore N183 Ford, and Raul Boesel, Ligier JS21 Ford.