Xin Zhao vs Master Yi

After Three Talon Strike (Q), land your three autos: the third one is a knock-up, and each one lowers your other spells' cooldowns by 1 second.

Land the thrust of Wind Becomes Lightning (W) before Audacious Charge (E): the Challenged target is revealed, and your charge reaches farther on them.

Hit your target right before Crescent Guard (R): Challenged, they stay with you while the others are knocked back, and damage from outside can't reach you for a moment.

Gank and skirmish as much as you can early on: Audacious Charge (E) and the Three Talon Strike (Q) knock-up matter most before everyone has their items.

Against Highlander (R), don't run alone: regroup with your team, because he gains speed and ignores slows.

If you have CC other than a slow, land it right after Alpha Strike (Q): during the strike, he's untargetable, and Highlander (R) ignores slows.

If you have CC, interrupt Meditate (W): he channels it to heal, more at low health, and to reduce the damage he takes.

Put pressure on his jungle early on: Master Yi is strongest once he has his items, and each stolen camp delays him.