Pantheon vs Yasuo

Start your trades with Shield Vault (W): you leap onto your target and stun them, so Comet Spear (Q) can't miss.

Tap Comet Spear (Q) for a short thrust that refunds part of the cooldown, or hold it to throw your spear farther.

Raise Aegis Assault (E) against enemy burst: you ignore damage from that direction, except from towers.

Roam with Grand Starfall (R): you leap from long range onto the chosen area, and the spell instantly readies Mortal Will (passive).

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.