Marcus Mariota had every reason to struggle when the communicator device in the Tennessee quarterback's helmet quit working two plays into the first drive of his second preseason game. Not a problem for the rookie. Mariota turned in a clean performance in his home debut, Tennessee cornerback Perrish Cox returned an interception 24 yards for a touchdown and the Titans beat St. Louis 27-14 on Sunday night to spoil Rams coach Jeff Fisher's return to town. Read more http://espn.go.com/nfl/recap?gameId=400790305
