This week, Michael Shelton previews the Round of 8 of the NASCAR Xfinity and Cup Playoffs that begin at Texas Motor Speedway this weekend! You'll hear from NASCAR Xfinity and Cup contenders Harrison Burton and Martin Truex Jr. before this weekend's races.You'll also hear from NASCAR Cup drivers Joey Logano and Tyler Reddick following testing of the Next Gen car earlier this week at Charlotte as well as NASCAR Hall of Famer Tony Stewart following the announcement of Tony Stewart Racing expanding to NHRA.Shelton also recaps the past week in Formula 1, World of Outlaws, NHRA and ARCA Menards racing.