Racing Positions49ers defensive end Aaron Lynch leaves practice with apparent injury9YNick WagonerO-line, backup QB among positions to watch as 49ers open preseason9YNick Wagoner49ers' Ray-Ray Armstrong takes turn with starters at weakside LB9YNick Wagoner49ers try to regroup after Donavin Newsom's scary injury9YNick Wagoner49ers rookie LB exits on stretcher after collision9YNick WagonerBrian Hoyer has strong practice despite facing constant pressure9YNick WagonerTwo cornerback jobs up for grabs as 49ers open camp9YNick Wagoner
