Sebastien Bourdais raced to his first IndyCar victory of the season Sunday, outlasting Takuma Sato in a caution-filled ending at Belle Isle.
Bourdais held on in his No. 11 Chevrolet in a race that was shortened from 70 laps to 68 because of a two-hour time limit. The first caution didn't come until lap 37, but there were eight caution periods in all — as well as a red flag with 5:33 remaining on the clock.
Bourdais led coming out of the final caution and had little trouble staying in front. The French driver's final lap of 1 minute 17.9133 seconds was the fastest for anyone on the day.
Graham Rahal finished third.
Carlos Munoz, who won Saturday's rain-shortened race, finished last Sunday.
Bourdais had enough fuel to finish strong after the string of cautions during the second half of the race. The red flag came after Penske teammates Will Power and Helio Castroneves crashed. The field came back under a yellow flag, which turned green with about 3:20 left.
Bourdais led Sato by 0.6 seconds after lap 66. By the end, his margin had almost tripled.
It was the 33rd IndyCar win of his career.
Bourdais' victory for KVSH Racing was a bright spot for Chevrolet on what was otherwise a fine weekend for Honda. Munoz won Saturday in a Honda, and the next eight spots after Bourdais on Sunday were taken up by Hondas.
On a chilly, rainy day in the Detroit area, Montoya led for 35 laps, dominating the first half of the race. He was still second heading into the restart from the sixth caution, but Sato passed him, and Montoya eventually faded.