Larson was quickest in the opening Sprint Cup practice with a lap of 192.902 mph in the no. 42 Target Chevrolet. Kasey Kahne, AJ Allmendinger, Ricky Stenhouse, Jr and Austin Dillon rounded out the top five.
In the Xfinity Series, Erik Jones logged the fastest lap, running 183.358 mph in the no. 20 Toyota. Ryan Reed was second, followed by Blake Koch, Jeb Burton and Ty Dillon.
Grant Enfinger was fastest in the first Camping World Truck Series practice, turning a lap of 179.574 mph. Christopher Bell, fresh off his rollover crash at Daytona last Saturday, was second. Matt Crafton, Daniel Hemric and John Wes Townley completed the top five.