How to counter Kennen
Let us take a look on how to beat Kennen. We will look at champions who are strong against Kennen and who are weak against Kennen. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Top champion who counters Kennen. You can already win in champion select with the right counters for Kennen. If you want to know how to counter Kennen then you need to take into account the best picks vs Kennen and the worst picks vs Kennen. This Kennen counter data is based on matches played by Pros on patch 15.14 and previous ones. It is important to see whether Pros counter picked Kennen or whether they played as Kennen.
Champions used by Pros to counter pick Kennen
Looking at the matches from Pros (see table Pros counter picked Kennen) we can see that they picked 
Jax most often to counter pick Kennen. The matchup Jax vs Kennen occured 18 times. Kennen has 10 wins and 8 losses in this matchup. Learn how to counter pick Jax to get another perspective on the data.
Lane outcome for Kennen
When looking at Kennen counters you will notice that win rates alone are not conclusional. Therefore we provide an overview (see table Lane Outcome) where you can see the lane outcome of Pros who played Kennen. The lane outcome of Kennen consists of three outcomes: Win, Loss or Draw. Let's take a look of Kennen lane and match outcome for specific matchups. Considering the lane outcome and the match outcome of a specific matchup, might enable you to find the right counter for Kennen.
Conclusion
Analyze the available data and learn how to beat Kennen. To master Kennen take also a look on Kennen builds and runes for Kennen. Good luck, Summoner!