It was Tracy's second win of the season and the 30th of his Champ Car career. Tracy, the pole winner, took control after a caution flag late in the race.
Two-time Cleveland GP winner Sebastien Bourdais was third and rookie Andrew Ranger finished a solid fourth.
In a minor incident, Ryan Hunter-Reay and Bjorn Wirdheim that came together near the back of the pack near the end.
The next event in the series is July 10 at Exhibition Place in Toronto.
Celebrity Families of 2014 [PHOTOS]