The Team Penske-Chevrolet ace, who dominated Race 1 at Iowa on Saturday, appeared set to do the same in Race 2, after wresting first place away from pole-sitting teammate Will Power before one-third distance and then leading 148 laps.
However, on the 235th of 300 laps, the #2 Penske appeared to ‘sit down’ on its rear right, looping the car into a spin that caused it to loop into heavy rear-end impact with the outside wall at Turn 4.
