Sheik

"Sheik is, in my personal opinion, one of the more difficult high tiers to learn to fight against as Marth. Her combo game on you is (arguably) better, her edge guarding is absolutely superior, and her ability to KO you is, well...also better because of dthrow fair, up smash, and up air. Not to mention her array of moves out of CC that combo into all of this.

But that’s okay, because Marth is Marth! He’s still got plenty of nasty things he can do to Sheik off of grab and he can make it Hell for her to get in and win neutral.

As usual, hopefully this guide provides some insight."