Qiyana vs Master Yi

Pick your Terrashape (W) element for the job: river for an Ice root, terrain for Rock's bonus damage on low-health targets, brush for Wild's invisibility.

Cast Terrashape (W) right after Elemental Wrath (Q): the dash resets its cooldown, so you can recast it in the same combo.

Cast Supreme Display of Talent (R) toward a wall near the enemies: the explosion runs along the whole edge of the obstacle, and any river or brush it crosses explodes too.

Roam with Wild, the brush element: Elemental Wrath (Q) then leaves a trail that makes you invisible and speeds you up.

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.