Hesperia (Calif.) Oak Hills On300 running back Karson Cox announced his commitment to UCLA on Tuesday following his official visit over the weekend. The 6-foot, 190-pound Cox chose to play for head coach DeShaun Foster and the new Bruins coaching staff over his other finalists in Arizona State and Oklahoma State. “What made UCLA right for me was the new coaching staff, the new Fos Era that is happening,” Cox told On3. “The energy that new whole coaching staff has of turning the team back into national competitors.” On3 ranks Cox as the nation’s No. 9 running back and No. 150 prospect overall. …