Zach Mettenberger aiming to be the Titans’ Week One starter

Jake Locker is no sure thing to win the Titans’ starting quarterback position, according to one of the Titans’ backups. Titans sixth-round pick Zach Mettenberger said on SiriusXM NFL Radio that his goal is to get the job “from day one.” “I’m going to make Jake work that much harder, make Charlie [Whitehurst] work that…