Yasuo vs Aatrox

Hit twice with Steel Tempest (Q), on minions if needed, to charge the whirlwind. Cast it during Sweeping Blade (E): the strike becomes a circle.

Keep moving before taking a trade: Way of the Wanderer (passive) builds your shield while you move, and it triggers on the first hit you take.

Chain Sweeping Blade (E) on different targets to reposition or dodge: each target has its own cooldown, so the spell comes back almost instantly.

Save Wind Wall (W) for a projectile that decides the teamfight, like Jinx's ult, rather than for poke: it blocks for 4 seconds, on a 25 to 17 second cooldown.

Watch for your allies' knock-ups: Last Breath (R) can be cast on any airborne champion, whether the knock-up comes from your whirlwind or Malphite's ult.

Stick to him or step out of range when he casts The Darkin Blade (Q): only the edge, at the end of each swing, knocks you into the air and deals full damage.

Leave the Infernal Chains (W) zone before it closes, with a dash if you have one: otherwise you get pulled back to the impact point and take the damage again.

Take a trade right after the three swings of The Darkin Blade (Q): it's his only knock-up, with a 14 to 6 second cooldown depending on rank.

Take short trades: Umbral Dash (E) heals him for part of all the damage he deals to champions, so a long trade favors him.

Once he hits level 6, back off when he casts World Ender (R): he gains AD and increased healing, and every takedown extends its duration.