Yasuo vs Katarina

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.

Stay away from her daggers on the ground: when she picks one up, Voracity (passive) hits every nearby enemy, and Shunpo (E) lets her blink to it.

Trade right after Shunpo (E): it's her only blink, and it has a 12 to 8 second cooldown, less if she picks up a dagger.

If you have CC, save it for Death Lotus (R): it's a channel, and interrupting it stops its damage.

Don't count on your healing during Death Lotus (R): each knife applies Grievous Wounds, which reduces healing received.