Kennen top

Steve Irwin

http://lolcounter.com/search.php?search=Renekton
try kennen top

Teemo does well, but you have to survive to lv 5. After that, shove lane and get dorans blades. From there you should be fine vs him. You may need to give up cs in order to not die early tho, so keep that in mind. If renekton jumps on you, it's gonna hurt >.<

Nobody's mention Vladimir? More sustain, range, and ability to escape his stun with pool. Bullies him out of lane easily.

As a gold rated player who mains top i cant give you any better advice other than gangplank. He zones with his Q too hard for renekton to do anything and can compete in damage when a 2 way exchange does occur. Not only that but i find most renektons will play overly aggresive when they cant exchange with parrrrleyyy and double dash to you, leaving them with no escape when your passive hits them after the exchange.

I play renek top quite a bit, Olaf and Vlad give me the most trouble and occasionally riven. I can still beat a vlad but it takes being on alert at all time and hes very hard to kill without a really good gank. WW is not a good counter, he has no escape from renek and his poke is only annoying until level 3 when you have access to your whole kit.

Anything ranged.

Honorable mentions to Kennen and Vlad

I find Fiora to do well. Double gap closer plus massive steriod AS steriod. Just make sure you time your W against his E. You'll still get stunned, but negate the damage. Double dorans + tabi + vamp scepter and the lane is heavily in your favor.