Yasuo

Kassadin

Malzahar

Anivia

Bird bitch is just going to make your life hell. Anivia's weakest point is her early game and Ahri can't punish her because hers is not that great either. Without jungle attention, Anivia is just going to perma-push the wave once she is level 6 and free-scale, 1v1 opportunities are slim as it's hard to kill her once, let alone through her egg again. Your jungler has to come mid to force her egg and Flash off CD for you to even attempt to kill her, but the easiest route is to match her wave shove and look for bot lane roams, as she's quite slow and not a good roamer.

Fizz

Zoe

Annoying to deal with early if she constantly shoves, if you catch her with a Charm post-6 she's more than likely dead if she has Ignite. If she has Barrier you'll need jungle attention to help break that off, and if she has Cleanse you can play around it by forcing her to Cleanse your Charm then immediately applying Ignite. You can take Cleanse or Ignite in this match-up, but with no Ignite you lose immense kill pressure. If she randomly ults you can get easy Charms on her. Once you're fed this match-up is really easy, but I'll put it at even because if you don't snowball well she wins.

Veigar

Syndra

Pretty fun match-up! It's quite even, slightly leaning towards the Syndra if both players are decently matched. Focus on dodging her Q harass early game and get some early boots. Merc Treads are very valuable in this match-up, and depending on what their jungle pick is, so is Cleanse. You have to use your ult well in 1v1s to dodge her Q/W as her ulti is unavoidable.

Orianna

One of the most even match-ups you'll have on mid lane. Pre-6 she wins this, her early game harass with Q combined with Aery and Scorch is pretty scary. Post-6 with good play from you you'll win the all-in and when you snowball it's hard for Orianna to do much

Morgana

Morgana mid-lane on her own is not a threat in the slightest, she will never kill you on her own and her whole kit revolves around just pushing the lane and making every lane match-up neutral, making it impossible to kill her. What you have to really worry about is what her jungler is and later on in the game, her bindings and the target of her Black Shields.

Irelia