Cho'Gath vs Yasuo

Aim Rupture (Q) where your opponent is going, not where they are: the area knocks them into the air and slows them.

Follow a successful Rupture (Q) with Feral Scream (W): the silence stops them from casting spells, dashes included.

Cast Vorpal Spikes (E) before a trade: your next 3 autos launch spikes that slow enemies in front of you and deal damage based on their max health.

Finish with Feast (R) as soon as it's up: each kill gives you permanent max health, but minions and non-epic monsters only give a limited amount.

Hit him with a cheap attack to trigger the Way of the Wanderer (passive) shield, then start the real trade: otherwise, it absorbs your best damage.

If you have projectiles, save them for after Wind Wall (W): it blocks them all for 4 seconds, on a 25 to 17 second cooldown. Other spells go through it.

Don't stand right behind your minions: each one gives him a target for Sweeping Blade (E), and he gets closer to you with every dash.

Get out of the line of his whirlwind, the third Steel Tempest (Q): without a knock-up, he can't cast Last Breath (R).

Judge his threat by his crit items more than his level: Way of the Wanderer (passive) raises his critical strike chance, so each crit item does more for him.