Yasuo vs Singed

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.

Don't chase Singed: behind him, Poison Trail (Q) damages you every second, and that's what he wants.

Get out of Mega Adhesive (W) fast: the glue slows and grounds you, so you can't dash.

If you're ranged, keep your distance: Fling (E) only works in melee range, and it throws you behind him, toward his allies.

If you have CC, use it on Singed when he dives, then hit his allies: he's hard to bring down, but he has to come into melee range.