LeBlanc vs Yasuo

After Sigil of Malice (Q), hit the target with another ability: the sigil only detonates on a spell, not on an auto.

Take your trades with Distortion (W): within 4 seconds, recast it to return to where you started.

After Ethereal Chains (E), keep the target chained for 1.5 seconds: they're then rooted and take extra damage, giving you time to land your burst.

In the mid game, look for isolated targets rather than head-on teamfights: your burst focuses one target, and Distortion (W) then takes you back out.

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.