Austin Dillon tops the speed chart in the Happy Hour practice session for the Nationwide Series Sam's Town 300 at Las Vegas Motor Speedway.
He ran a fast lap of 179.647 in the No. 3 Chevrolet Camaro. No. 20 Brian Vickers, No. 12 Sam Hornish Jr., No. 6 Trevor Bayne and No. 2 Brian Scott rounded out the top five of the 39 cars out on the track. The No. 23, driven by Robert Richardson Jr., was the slowest in the final practice session.