Oakland Raiders quarterback Derek Carr (4) warms up by throwing a pass before the start of their preseason NFL game against the Detroit Lions at O.co
Oakland Raiders quarterback Derek Carr (4) warms up by throwing a pass before the start of their preseason NFL game against the Detroit Lions at O.co Coliseum in Oakland, Calif., on Friday, Aug. 15, 2014. The Raiders went on to win the game 27-26. (Doug Duran/Bay Area News Group) ( Doug Duran )