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.