Ambessa vs Master Yi

Weave an auto between spells: Drakehound's Step (passive) empowers it and refunds energy, while your three basic spells cost 70 each.

Hit with the edge of Cunning Sweep (Q): enemies caught by the edge take much more damage, and landing it readies Sundering Slam (Q).

Take a short trade: Cunning Sweep (Q), an auto, then Lacerate (E) with a dash backward, which adds a strike at the end of the dash.

Cast Public Execution (R) toward the enemy carry: you blink to the farthest enemy champion in the line you choose, nothing can stop you, and you suppress them.

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.