“Rengar can be a tough TOP laner to go up against if he does go top, he's primarily a JNG. It's quite simple really. Let him win the lane. You can not do anything to him and he is efficiently capable of zoning you out of minion CS range. Just let him push and farm under your tower. Sidestep or use your minions to body block his bolas, or be snared/slowed and chased down. It may be demoralizing but this is what you absolutely need to do to survive this lane, please do not try to be some hero, unless he is mentally incapable of playing the champion correctly by camping bushes, then you lose this HARD. His (R) will reveal you so don't play passive game once he is 6.
“Beware of Rengar's level 1-3, respect him and let him push the wave into your tower. Stand at your river side of the lane and trade on him when he jumps a creep, but don't overtrade, just Q, auto, W and E away to reset the trade. You can all-in at level 6 because his ult isn't really a combat ult, whereas yours is. Healing cut isn't a bad idea because some Rengars max W for sustain. Try not to fight when he has full ferocity.”
“Take Conqueror. You can fight him level 1, but don't even try to fight him when he has 3-4 ferocity stacks. There isn't much of a point in fighting him until you buy a bramble vest because he heals off all the damage you do with his double W, after you have bramble you win. He will probably try to roam after level 6 so make sure you have TP to follow him. Try to group with your team out of lane because he will try to get picks with his ultimate. ”
“If it's Rengar top lane, he will be jumping in and out of bushes nonstop. He's going to jump to low health minions to last hit them. Just aim your Q over your low health minions while he's in the bush, so he'll either miss the minion(s) or get hit by your Q for a lot of damage and CC. Your E is pretty effective against him as well, slowing him down enough to not let him get back in the bush right away. If he builds assassin, he shouldn't be able to oneshot you. If he goes tank or bruiser he'll be more of a threat. When he ults away, it's not worth trying to chase him, you won't catch him unless you have a teammate on him. If you can consistently Q him at the right times and time or shield correctly you should be able to win this matchup fairly easily. He's pretty hard to kill though so don't greed for kills, just farm up and you'll be fine.”
“Similiar to Irelia but a little weaker for an All in. Stay away from the bushes and you should be fine. Rush Ninja Tabi.”
“Opt to build tank against Rengar, Rengar has a lot of burst damage potential if he is near the brush. Use Mega Adhesive to prevent Unseen Predator(Passive). (Recommended Items: Plated Steelcaps, Rylai's Scepter) (Sustained 1v1 Battles: Even) (Outscaling Edge: Singed) (Mega Adhesive prevents Unseen Predator) (Fling can override Unseen Predator)”
“Try to push fast lane don't let him control bushes cuz he will outdamage you so hard. His W is denying your stun and healing him back from all your dmg you dealt to him. Fast rush tabi and and Sheen for kill potential. Your E block his Q.”
“Do not fight him lvl 1, sit back and let him jump around. You want to parry his empowered Q and dont be afraid to chase him down afterwards to punish him. When he ults, parry as soon as he lands on you. You should win if you ult right after to finish the job.”
“You won't see it much, but this matchup REALLY sucks. Top lane is full of bushes, which Rengar will hide in while you try to farm and pounce on you. He can use his roar to cleanse your wither. He can stun and combo you quickly. The best you can do is hide under turret and try to not stay too far behind. Don't risk walking up for CS @ lvl 1&2 or you'll lose half your HP bar. The win % in this matchup in Plat+ is abysmal for Nasus, for good reason.”
“Rengar relies on cheese to lane. Darius is a hard counter to him because Rengar cannot take short trades to burst us down, we just pull him back in and trade better.
Easy lane. Beware of level 1 though.”