It's easy to make mistakes against Tager, and if it's against a decent tager, it can cost you the match.
My advice for tagers, if you ever get a chance to corner Nus, stick to a mix between pokes and throws. Also, your backdash is awesome, use it.
But since this isn't Tager vs Nu, maybe I should give some advice for the nu players here.
Ehh..... I am sure someone said it before, but Gravity Field is pretty good to use against tagers. Beware of High Jumping > jC > jGuard/j2C tagers. His jC boosts him forward a bit (mini airdash).