Singed vs Yasuo

Cast Mega Adhesive (W) behind you, then Fling (E): a target flung into the glue is rooted there.

Cast Mega Adhesive (W) under an enemy who has a dash: in the glue, they're slowed and grounded, so they can't dash.

Circle around enemies with Poison Trail (Q) on: every enemy following you walks through the poison, which damages them every second.

Drink Insanity Potion (R) before you dive: you gain power, resistances and speed, and your trail applies Grievous Wounds, which reduces their healing.

In a side lane, draw several enemies into chasing you: they walk through Poison Trail (Q), and that's that many players missing from objectives.

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.