How to counter Fiora
Let us take a look on how to beat Fiora. We will look at champions who are strong against Fiora and who are weak against Fiora. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Top champion who counters Fiora. You can already win in champion select with the right counters for Fiora. If you want to know how to counter Fiora then you need to take into account the best picks vs Fiora and the worst picks vs Fiora. This Fiora counter data is based on matches played by Pros on patch 14.23 and previous ones. It is important to see whether Pros counter picked Fiora or whether they played as Fiora.
Champions used by Pros to counter pick Fiora
Looking at the matches from Pros (see table Pros counter picked Fiora) we can see that they picked 
Gnar most often to counter pick Fiora. The matchup Gnar vs Fiora occured 26 times. Fiora has 17 wins and 9 losses in this matchup. Learn how to counter pick Gnar to get another perspective on the data.
Lane outcome for Fiora
When looking at Fiora 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 Fiora. The lane outcome of Fiora consists of three outcomes: Win, Loss or Draw. Let's take a look of Fiora 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 Fiora.
Conclusion
Analyze the available data and learn how to beat Fiora. To master Fiora take also a look on Fiora builds and runes for Fiora. Good luck, Summoner!