The Chip Ganassi Racing driver moved to the top of the standings by finishing third behind first-time winner Kyle Kirkwood and his Andretti Autosport team-mate Romain Grosjean.
Ericsson, who started on the front row on a street course for the first time, lost out to Team Penske’s Josef Newgarden in the pits when the majority of the field stopped under yellow, and then on the lap 25 restart was passed by O’Ward between Turns 7 and 8.
