Reddick led the way at 89.924mph, completing his fast lap 20.017 seconds.
There were multiple spins including Alex Bowman, Joey Logano, Justin Haley, Ross Chastain, and Chase Elliott who actually spun twice. Denny Hamlin also made contact with the outside wall.
There will be another practice today for Cup teams to work on their cars before the qualifying races on Saturday.
