Related: Full practice results
The two-hour and 50-minute session was the lone practice of the weekend for the Nationwide cars, which qualify Friday afternoon before competing in the Food City 250 under the lights on the half-mile track.
Justin Allgaier posted the second-fastest speed, followed by Camping World Truck Series regular Ty Dillon and reigning Sprint Cup Series champion Brad Keselowski. Kyle Larson, Trevor Bayne, Nationwide points leader Sam Hornish Jr., Alex Bowman, Sprint Cup star Kyle Busch and Kenny Wallace rounded out the top 10.
Busch is going for his second career tripleheader sweep after winning the Truck Series event at Bristol on Wednesday night. He owns the only tripleheader sweep in NASCAR history, at Bristol in the late summer of 2010.
The long practice was halted a few times for accidents, most notably spins involving Mike Wallace and Carl Long. Robert Richardson Jr. also incurred damage by getting up against the wall, and Elliott Sadler scratched up the right-rear of his vehicle by making some contact with the wall.
During the practice session, Busch also drove in Sadler's car (his teammate at Joe Gibbs Racing) for some laps to help with the setup of the car.
Hornish leads the Nationwide standings by 13 points over Sadler, who posted the 16th-best speed of the session. Hornish also incurred some right side scraps during practice. Other title contenders included Austin Dillon (11th-fastest in the session), Regan Smith (12th), and Brian Vickers (20th).
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