Oakland Raiders defensive end Khalil Mack stretches at training camp Friday, July 29, 2016, in Napa.
Oakland Raiders defensive end Khalil Mack stretches at training camp Friday, July 29, 2016, in Napa. Eric Risberg The Associated Press
Oakland Raiders defensive end Khalil Mack stretches at training camp Friday, July 29, 2016, in Napa. Eric Risberg The Associated Press