There are four IndyCar races to go after Pato O’Ward’s win on Sunday in Toronto, and only four drivers remain in the hunt with a mathematical chance of winning the championship.

Chevrolet podiums at the Iowa Speedway by driver: Josef Newgarden (9), Will Power (7), Pato O’Ward (5), Scott McLaughlin (4), Tony Kanaan (3), Ryan Hunter-Reay (2), Marco Andretti (1), Oliver Askew (1 ...