Nidalee vs Hecarim Jungle Matchup
Nidalee Jungle wins 44.7% of 494 Low Elo games against Hecarim Jungle, -1.4 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 Nidalee
Pressure Hecarim early with counter-jungling and counterganks, and track his position before committing to a major gank or objective; his movement speed makes it easy for him to catch you or countergank.
Keep a wall nearby when Hecarim uses Devastating Charge(E) to run you down. Pounce(W) can get you over the terrain; account for Onslaught of Shadows(R), which can let him follow.
Devastating Charge(E) gives Hecarim movement speed to close distance, while Nidalee's Pounce(W) can jump her over terrain in cougar form.
How to play as Hecarim
Ward your jungle entrance before camps spawn. If Nidalee appears at your second buff, skip that camp and clear the other side rather than taking an exposed fight.
Sources
These notes come from r/NidaleeMains and r/HecarimMains, checked against the champions' abilities.