Kyle Kirkwood emerged with the fastest lap of the weekend in a morning practice interrupted by several red flags.

Rinus VeeKay lost an engine to bring out the second stoppage of Detroit Grand Prix practice. The first one was to retrieve a blue flag dropped by a corner marshal.

Christian Lundgaard lost his engine during the first group practice. It has been a difficult month for Chevy engines beginning with the Open test in late April.

Kirkwood had scraped the wall with his right rear tire, but he returned before the end of the group round to set the quickest lap. Just 4 tenths of a send separate Kirkwood from fourth place Alex Palou.

Results:

Qualifying Groups;

Group 2 looks brutal. One contender might get knocked out.