How to counter Shaco
Let us take a look on how to beat Shaco. We will look at champions who are strong against Shaco and who are weak against Shaco. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Jungle champion who counters Shaco. You can already win in champion select with the right counters for Shaco. If you want to know how to counter Shaco then you need to take into account the best picks vs Shaco and the worst picks vs Shaco. This Shaco 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 Shaco or whether they played as Shaco.
Champions used by Pros to counter pick Shaco
Looking at the matches from Pros (see table Pros counter picked Shaco) we can see that they picked 
Lee Sin most often to counter pick Shaco. The matchup Lee Sin vs Shaco occured 55 times. Shaco has 30 wins and 25 losses in this matchup. Learn how to counter pick Lee Sin to get another perspective on the data.
Lane outcome for Shaco
When looking at Shaco 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 Shaco. The lane outcome of Shaco consists of three outcomes: Win, Loss or Draw. Let's take a look of Shaco 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 Shaco.
Conclusion
Analyze the available data and learn how to beat Shaco. To master Shaco take also a look on Shaco builds and runes for Shaco. Good luck, Summoner!