Yasuo vs Kog'Maw

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.

Engage when Bio-Arcane Barrage (W) ends: his attack range drops back to 500, and the spell has a 17-second cooldown.

If you can engage, go for him: with no dash or leap, Kog'Maw can only back off on foot, and Void Ooze (E) is his only slow.

Below 40% health, get out of range of Living Artillery (R): each shot then deals its max damage to you, and it reaches very far.

When he dies, move away from him: Icathian Surprise (passive) makes him explode 4 seconds later, dealing true damage to nearby enemies.