Master Yi vs Fiddlesticks

Cast Alpha Strike (Q) to dodge a spell or a burst: you're untargetable during the strike, and your autos lower its cooldown.

Cast Meditate (W) to tank a burst mid-teamfight: you take less damage, heal more at low health, and the time left on Highlander (R) is paused.

Activate Highlander (R) to chase: you gain move speed and attack speed, and slows no longer affect you.

Chain kills in teamfights: each takedown lowers the remaining cooldown of your basic spells, and extends Highlander (R) if it's active.

Stay out of range of Terrify (Q), a targeted spell that reaches 575: if your range is longer, hit him from there without risking the fear.

If you have CC, interrupt Bountiful Harvest (W): he heals during the channel, and if he finishes it, the remaining cooldown drops by 60%.

Spread out from your allies when he arrives: Crowstorm (R) hits every enemy around him, and Bountiful Harvest (W) drains them all.

Ward the brushes and flanks around objectives: spotted in time, he loses the surprise of Crowstorm (R) and the passive fear of Terrify (Q).