Briar vs Master Yi

Cast Blood Frenzy (W) only when you want to end the fight: you charge the nearest enemy, champions first, without choosing your target.

Save Snack Attack (W) for when you're low: your next auto deals damage based on the target's missing health and heals you for part of it.

Fully charge Chilling Scream (E) near a wall: the scream then knocks enemies back, and those who hit the wall are stunned.

Cast Certain Death (R) across the map to engage or catch a target: you fly to the first champion hit and chase them until they die.

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.