Rengar vs Kha'Zix Jungle Matchup
Rengar Jungle wins 48.0% of 2,666 Low Elo games against Kha'Zix Jungle, +0.8 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.
Why Rengar is favored
Rengar's Thrill of the Hunt (R) reveals and lets him leap onto the nearest enemy, so Kha'Zix cannot count on Void Assault (R) to hide or disengage. Rengar can also pressure Kha'Zix with early brush-based invasions, making his high-elo edge especially clear.
Measured in High Elo: Rengar wins 1.6pp more often than expected over 1,550 games.
How to play as Rengar
Use brush to threaten early invades, then activate Thrill of the Hunt (R) to track Kha'Zix through Void Assault (R) and leap onto him before he can escape.
Thrill of the Hunt (R) reveals the nearest enemy and lets Rengar leap to them without brush, so Kha'Zix's Void Assault (R) does not guarantee an escape; Kha'Zix players report that Rengar can see them through invisibility.
Rengar's brush leap gives him a level-three invade threat against Kha'Zix, and Kha'Zix players describe him as a dangerous early jungle opponent.
How to play as Kha'Zix
Avoid contesting Rengar alone around brush early if you do not know his path; players report level-three invasions. At level six, do not treat Void Assault (R) as a safe escape after Rengar starts his own ultimate.
Sources
These notes come from r/KhaZixMains, checked against the champions' abilities.