Fiora

Fiora is a painful matchup for a handful of reasons. The most obvious one is, she scales way better than Aatrox, while still having tools that let her stomp him in early game. She has a dash that has a short cooldown if she hits anything with it, an counter attack which she can reliably stun you with, and to top it off, a passive that lets her hit you for a %max hp true damage while healing herself and boosting her movement speed. In order to defeat her, you need to buy plated steelcaps, and a bramble vest early. When trading with her, avoid using E so you can easly dodge her W when she parries you, and don't get into meele range unless you are winning. If she ults you, try to hug a wall with one of the vital points, to bodyblock her from taking out all 4, or if possible just retreat.