Twitch vs Yasuo

Approach camouflaged with Ambush (Q), then start the fight: when you leave camouflage, you gain bonus attack speed.

Throw Venom Cask (W) at an enemy fleeing out of your range: the cloud slows them and adds a Deadly Venom (passive) stack every second.

Apply as many Deadly Venom (passive) stacks as you can before Contaminate (E): each stack adds damage, and the spell hits every poisoned enemy within 1200 range.

During Spray and Pray (R), stay back and aim at their carries through the frontline: your bolts pierce every enemy, with less damage after the first.

When a champion dies poisoned by Deadly Venom (passive), Ambush (Q) comes back right away: recast it to reposition in the middle of the teamfight.

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.