Master Yi vs Kayn Jungle Matchup

Master Yi Jungle wins 53.0% of 9,541 Low Elo games against Kayn Jungle, +2.1 points vs expected, 2-patch window 26.19-26.20.

Researched on LoL patch 26.20. Tips are written to hold at any rank; stats come from Low Elo ranked games up to patch 26.20.

How to play as Master Yi

Hold Meditate(W) for Kayn's burst instead of spending it on an auto reset; Kayn can threaten Umbral Trespass(R) once you have used the damage reduction.

Master Yi's Alpha Strike(Q) makes him untargetable during its dash, while Kayn's Blade's Reach(W) is a line attack; a timed Q can avoid Kayn's main setup.

Meditate(W) reduces incoming damage, so it can blunt Kayn's Umbral Trespass(R); if Yi spends it on an auto attack reset, that defensive window is gone.

How to play as Kayn

Avoid an isolated duel with Master Yi before form; look for a skirmish with teammates, and punish only after he uses Meditate(W), when it can no longer reduce Umbral Trespass(R)'s damage.

Sources

These notes come from r/KaynMains, checked against the champions' abilities.