How to counter Naafiri
Let us take a look on how to beat Naafiri. We will look at champions who are strong against Naafiri and who are weak against Naafiri. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Mid champion who counters Naafiri. You can already win in champion select with the right counters for Naafiri. If you want to know how to counter Naafiri then you need to take into account the best picks vs Naafiri and the worst picks vs Naafiri. This Naafiri counter data is based on matches played by Pros on patch 14.9 and previous ones. It is important to see whether Pros counter picked Naafiri or whether they played as Naafiri.
Champions used by Pros to counter pick Naafiri
Looking at the matches from Pros (see table Pros counter picked Naafiri) we can see that they picked 
Ahri most often to counter pick Naafiri. The matchup Ahri vs Naafiri occured 6 times. Naafiri has 4 wins and 2 losses in this matchup. Learn how to counter pick Ahri to get another perspective on the data.
Lane outcome for Naafiri
When looking at Naafiri 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 Naafiri. The lane outcome of Naafiri consists of three outcomes: Win, Loss or Draw. Let's take a look of Naafiri 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 Naafiri.
Conclusion
Analyze the available data and learn how to beat Naafiri. To master Naafiri take also a look on Naafiri builds and runes for Naafiri. Good luck, Summoner!