How to counter Quinn
Let us take a look on how to beat Quinn. We will look at champions who are strong against Quinn and who are weak against Quinn. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Top champion who counters Quinn. You can already win in champion select with the right counters for Quinn. If you want to know how to counter Quinn then you need to take into account the best picks vs Quinn and the worst picks vs Quinn. This Quinn counter data is based on matches played by Pros on patch 14.12 and previous ones. It is important to see whether Pros counter picked Quinn or whether they played as Quinn.
Champions used by Pros to counter pick Quinn
Looking at the matches from Pros (see table Pros counter picked Quinn) we can see that they picked 
Renekton most often to counter pick Quinn. The matchup Renekton vs Quinn occured 8 times. Quinn has 6 wins and 2 losses in this matchup. Learn how to counter pick Renekton to get another perspective on the data.
Lane outcome for Quinn
When looking at Quinn 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 Quinn. The lane outcome of Quinn consists of three outcomes: Win, Loss or Draw. Let's take a look of Quinn 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 Quinn.
Conclusion
Analyze the available data and learn how to beat Quinn. To master Quinn take also a look on Quinn builds and runes for Quinn. Good luck, Summoner!