How to counter Vi
Let us take a look on how to beat Vi. We will look at champions who are strong against Vi and who are weak against Vi. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Jungle champion who counters Vi. You can already win in champion select with the right counters for Vi. If you want to know how to counter Vi then you need to take into account the best picks vs Vi and the worst picks vs Vi. This Vi 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 Vi or whether they played as Vi.
Champions used by Pros to counter pick Vi
Looking at the matches from Pros (see table Pros counter picked Vi) we can see that they picked 
Lee Sin most often to counter pick Vi. The matchup Lee Sin vs Vi occured 115 times. Vi has 60 wins and 55 losses in this matchup. Learn how to counter pick Lee Sin to get another perspective on the data.
Lane outcome for Vi
When looking at Vi 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 Vi. The lane outcome of Vi consists of three outcomes: Win, Loss or Draw. Let's take a look of Vi 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 Vi.
Conclusion
Analyze the available data and learn how to beat Vi. To master Vi take also a look on Vi builds and runes for Vi. Good luck, Summoner!