The champions I can't manage to win against:
Zed, LeBlanc, Ahri, Draven, Annie.
Zed - I think people already said enough in the boards.
LeBlanc - Her burst is insane, and her safety is also pretty good. I'm usually too afraid to go all in on her cause she will outdamage me.
Ahri - Her Q feels so strong, and in late game she can burst me down. Also the free 3 flashes every 60 seconds can annoy me.
Draven - I can't manage to outdamage him in any case, mainly cause those axes rip off my flesh like no tomorrow. Also it's pretty hard to outrun him if he manages to trip me with his spooky scary ghost axes.
Annie - Burst.