How to counter Fiddlesticks
Let us take a look on how to beat Fiddlesticks. We will look at champions who are strong against Fiddlesticks and who are weak against Fiddlesticks. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Support champion who counters Fiddlesticks. You can already win in champion select with the right counters for Fiddlesticks. If you want to know how to counter Fiddlesticks then you need to take into account the best picks vs Fiddlesticks and the worst picks vs Fiddlesticks. This Fiddlesticks 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 Fiddlesticks or whether they played as Fiddlesticks.
Champions used by Pros to counter pick Fiddlesticks
Looking at the matches from Pros (see table Pros counter picked Fiddlesticks) we can see that they picked 
Alistar most often to counter pick Fiddlesticks. The matchup Alistar vs Fiddlesticks occured 7 times. Fiddlesticks has 2 wins and 5 losses in this matchup. Learn how to counter pick Alistar to get another perspective on the data.
Lane outcome for Fiddlesticks
When looking at Fiddlesticks 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 Fiddlesticks. The lane outcome of Fiddlesticks consists of three outcomes: Win, Loss or Draw. Let's take a look of Fiddlesticks 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 Fiddlesticks.
Conclusion
Analyze the available data and learn how to beat Fiddlesticks. To master Fiddlesticks take also a look on Fiddlesticks builds and runes for Fiddlesticks. Good luck, Summoner!