Tryndamere

Tryndamere is a very tough matchup, due to his passive and his high potential on early-mid game. Though if you are patient enough and if your team has enough cc, he will mean no danger.

Fiora

Fiora is a unique matchup for darius. She can counter him with multiple ways. Though if you get bramblevest , rush Randuin's Omen after and attack her little by little till she wastes her w, you can all in her while watching out where to step depending on where the vitals are. In case of her R, just step on a wall, which is a typical Fiora's R counter.

Volibear

Camille

Cho'Gath

Irelia

Irelia is one of the worst Darius' nightmares on late game. But you can slow her down by taking lethal tempo and rushing armor items on early. By doing that and helping you AD Carry get ahead, the game shall be over before Irelia reaching late game.

Urgot

Gwen

Wukong

Renekton

Teemo

Teemo is one of many matchups, in which you have to get QSS and Maw of Malmortius followed by an Oracle's Lens. By doing that, Teemo shall not be that much of a challenge, thoguh thanks to his R, you may not expect any ganks from your jungler, meaning that you are open to 1v2 or even 1v3 fights if enemy mid laners desides to roam Top.

Vayne