Rengar vs Jax Jungle Matchup

Rengar Jungle wins 43.0% of 453 Low Elo games against Jax Jungle, -0.6 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 Rengar

Don't brute-force a fight through Counter Strike. Jump or slow away, then use empowered W if Jax stuns you, or empowered E to root him for your teammates; re-engage after his E ends.

Look for an invade before level 6 if the early position is safe, and avoid taking a solo duel with Jax once he reaches 6; Rengar players in this jungle matchup describe that as the point where Jax takes over the 1v1. (Unverified: no source confirms this note.)

Rengar's empowered Bola Strike(E) can root Jax, while empowered Battle Roar(W) can remove Jax's Counter Strike stun if it lands.

Sources

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