The sports books opened Stanford vs. Arizona State with the Cardinal favored by 16 1⁄2 points and the spread has stayed steady right at Stanford by 17. The slight change in the line reflects that early bettors have laid a bit more money down on Stanford than Arizona State to cover the spread.
Vegas lines and odds aren't meant to be predictive. They are made to entice betting in equal portions on each side of the spread. However, combining the line and the over/under usually ends up close to some computer models.