How to counter Shen
Let us take a look on how to beat Shen. We will look at champions who are strong against Shen and who are weak against Shen. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Top champion who counters Shen. You can already win in champion select with the right counters for Shen. If you want to know how to counter Shen then you need to take into account the best picks vs Shen and the worst picks vs Shen. This Shen counter data is based on matches played by Pros on patch 15.9 and previous ones. It is important to see whether Pros counter picked Shen or whether they played as Shen.
Champions used by Pros to counter pick Shen
Looking at the matches from Pros (see table Pros counter picked Shen) we can see that they picked 
Gnar most often to counter pick Shen. The matchup Gnar vs Shen occured 18 times. Shen has 6 wins and 12 losses in this matchup. Learn how to counter pick Gnar to get another perspective on the data.
Lane outcome for Shen
When looking at Shen 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 Shen. The lane outcome of Shen consists of three outcomes: Win, Loss or Draw. Let's take a look of Shen 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 Shen.
Conclusion
Analyze the available data and learn how to beat Shen. To master Shen take also a look on Shen builds and runes for Shen. Good luck, Summoner!