Riven vs Kennen?
Im just wondering how you beat riven vs a kennen. I just got completely stomped as Riven. I consider myself to be an above average Riven as well and can almost always win lane against my counters. This was just a complete bitch though. When ever I tried to do a trade I was screwed over by him running away with his e or his stun. Any tips?
and Merc treads 
, don't over-commit and try to survive.
but to answer your question, his running away ball of hate and malice, costs a great deal of energy if it doesn't run into a champion, so try and get him to spam his q so he runs out of energy to run away