Gustavo Yacaman (Team Moore Racing), after starting sixth on the grid, won the Indy Lights presented at the Detroit Belle Isle circuit on Saturday.
The Colombian worked his way up front during the early stages of the race and took the lead away from pole-sitter Oliver Webb two thirds of the way through the race.
Webb had also to let go of the second spot when Andretti Autosport rookie Carlos Munoz passed him around the outside, leaving the Briton to settle for third in Sam Schmidt Motorsports' lead car.
The race switched from a lap race to a timed race following a lengthy spell under yellows triggered by Younessi Racing's Peter Dempsey, who crashed heavily while chasing Victor Carbone for second on lap 13.
Carbone ended the race in fourth ahead of Schmidt teammates Tristan Vautier and Esteban Guerrieri.
The Colombian worked his way up front during the early stages of the race and took the lead away from pole-sitter Oliver Webb two thirds of the way through the race.
Webb had also to let go of the second spot when Andretti Autosport rookie Carlos Munoz passed him around the outside, leaving the Briton to settle for third in Sam Schmidt Motorsports' lead car.
The race switched from a lap race to a timed race following a lengthy spell under yellows triggered by Younessi Racing's Peter Dempsey, who crashed heavily while chasing Victor Carbone for second on lap 13.
Carbone ended the race in fourth ahead of Schmidt teammates Tristan Vautier and Esteban Guerrieri.