Yone vs Master Yi

Hit twice with Mortal Steel (Q), minions included, to charge the next one: it makes you dash forward and knocks the enemies hit into the air.

Cast Spirit Cleave (W) on several champions at once: it deals damage based on their max health, and your shield grows with the number of champions hit.

Cast Soul Unbound (E) to engage: when it ends, you snap back to the body you left behind, and part of the damage you dealt to champions is repeated.

Cast Fate Sealed (R) through several enemies: everyone in the line is hit and knocked into the air toward you, and you reappear behind the last champion hit.

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.