At Indianapolis Motor Speedway Road Course, Lundgaard passed David Malukas with 18 laps left for his first IndyCar victory since 2023.
The race featured 12 caution laps and six lead changes, while Felix Rosenqvist went airborne after contact with Pato O'Ward at Turn 13 and finished 23rd.
Marcus Ericsson, Christian Rasmussen and Alexander Rossi failed to finish, and the crash-filled event served as the lead-in to this month's Indianapolis 500.
IndyCar's new tech was meant to stop airborne crashes. Why did Rosenqvist's car still take flight at Indianapolis?
After a 47-race drought, has Christian Lundgaard truly 'unlocked the door' to becoming an IndyCar championship contender?