Locke vs Yasuo

Cast Ritual Nails (Q) before Ashen Pursuit (E): your hits consume the nails stuck in the target, and each extra nail adds damage.

Finish off wounded targets with autos: Silver Stake (passive) adds magic damage that grows with their missing health.

Activate Soul Ignition (W) at the start of a trade: it costs you health, but at the end, you heal back part of the last damage taken, plus more based on your missing health.

Save Ashen Pursuit (E) for a sure kill or to escape a gank: it's your only instant movement, it has a 10-second cooldown, and only a takedown resets it.

Save Purgatory (R) to finish: it seals marked enemies below a health threshold, and when you pick up the artifact, each sealed champion raises that threshold for good.

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.