Detroit GP: Andrea de Cesaris, Alfa Romeo 183T, leads Michele Alboreto, Tyrrell 011 Ford, Derek Warwick, Toleman TG183B Hart, Keke Rosberg, Williams FW08C Ford, and Eddie Cheever, Renault RE40.
Andrea de Cesaris, Alfa Romeo 183T, leads Michele Alboreto, Tyrrell 011 Ford, Derek Warwick, Toleman TG183B Hart, Keke Rosberg, Williams FW08C Ford, and Eddie Cheever, Renault RE40.