Ryan Hunter-Reay won his first IndyCar race since 2015, prevailing at Belle Isle after teammate Alexander Rossi slid off the track at a turn with about seven laps to go.
Rossi, the pole winner, was struggling to hold off Hunter-Reay before the mishap at a right turn on lap 64 of 70. From there, it was smooth sailing for Hunter-Reay on the 2.35-mile street course. He finished more than 11 seconds ahead of second-place Will Power.
Ed Jones finished third, followed by Scott Dixon. Rossi fell to 12th and dropped out of the series points lead.
Power, the Indianapolis 500 champion, returned to the top of the season standings. He'd fallen to third place after Saturday's race, in which Dixon outlasted Hunter-Reay for the win.
Hunter-Reay won the weekend's second IndyCar race for his 17th career win. It was the 59th for Andretti Autosport.