49ers in Five: Robert Saleh puts the safeties on notice

Robert Saleh puts the safeties on notice San Francisco 49ers defensive coordinator Robert Saleh let everyone there's an open competition at the third level of the 49ers defense. Plus, Trent Williams gives an early scouting report on Mykel Williams. One Thing to Read: The defense could have 8 new starters One Thing to Watch: OL Film Breakdown CHECK OUT UNDERDOG FANTASY: Sign up and deposit for Underdog HERE with promo