Warwick vs Master Yi

Hold Jaws of the Beast (Q) to latch onto your target: you follow all their movement, dashes included, then leap behind them.

Cast Primal Howl (E) in the middle of the fight: you take less damage, then the howl fears nearby enemies. Recast it to fear sooner.

Cast Infinite Duress (R) on their carry: you suppress the first champion hit and heal for all the damage dealt. Your move speed lengthens the leap.

Follow the Blood Hunt (W) trails: you sense champions below 50% health and gain speed toward them, three times more below 25%.

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.