Dixon spun his Chip Ganassi Racing car on the exit of Canada Corner and let Andretti Autosport's Romain Grosjean past him as he got back up to racing speed. But Dixon then suddenly swerved left into the path of Team Penske's Will Power, who was on a hot lap.
The pair collided, smashing the left-front wheel of Dixon's car before they both slammed into the concrete wall.
