Carlos Munoz took an easy win in a mostly processional Firestone Indy Lights race at Barber Motorsports Park.
The Andretti driver started from pole and held his advantage throughout the race to finish just over five seconds clear of Jack Hawksworth, picking up his third career win.
The only significant position change came in the battle for third, where Gabby Chaves was able to get ahead of Sage Karam to complete the podium.
Karam had earlier been on the receiving end of a hit from Juan Pablo Garcia, an incident that resulted in the latter being issued a drive-through for avoidable contact, but he hounded Chaves right to the finish. The pair were split by just 0.1sec at the flag, although they were more than 48sec behind the winner.
Zach Veach fell out of the podium battle after suffering a puncture, leaving Jorge Goncalvez to finish fifth ahead of Peter Dempsey, Victor Carbone and Juan Pablo Garcia.