How to counter Kalista
Let us take a look on how to beat Kalista. We will look at champions who are strong against Kalista and who are weak against Kalista. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Adc champion who counters Kalista. You can already win in champion select with the right counters for Kalista. If you want to know how to counter Kalista then you need to take into account the best picks vs Kalista and the worst picks vs Kalista. This Kalista counter data is based on matches played by Pros on patch 14.10 and previous ones. It is important to see whether Pros counter picked Kalista or whether they played as Kalista.
Champions used by Pros to counter pick Kalista
Looking at the matches from Pros (see table Pros counter picked Kalista) we can see that they picked 
Varus most often to counter pick Kalista. The matchup Varus vs Kalista occured 66 times. Kalista has 33 wins and 33 losses in this matchup. Learn how to counter pick Varus to get another perspective on the data.
Lane outcome for Kalista
When looking at Kalista 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 Kalista. The lane outcome of Kalista consists of three outcomes: Win, Loss or Draw. Let's take a look of Kalista 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 Kalista.
Conclusion
Analyze the available data and learn how to beat Kalista. To master Kalista take also a look on Kalista builds and runes for Kalista. Good luck, Summoner!