How to counter Renata Glasc
Let us take a look on how to beat Renata Glasc. We will look at champions who are strong against Renata Glasc and who are weak against Renata Glasc. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Support champion who counters Renata Glasc. You can already win in champion select with the right counters for Renata Glasc. If you want to know how to counter Renata Glasc then you need to take into account the best picks vs Renata Glasc and the worst picks vs Renata Glasc. This Renata Glasc counter data is based on matches played by Pros on patch 15.14 and previous ones. It is important to see whether Pros counter picked Renata Glasc or whether they played as Renata Glasc.
Champions used by Pros to counter pick Renata Glasc
Looking at the matches from Pros (see table Pros counter picked Renata Glasc) we can see that they picked 
Alistar most often to counter pick Renata Glasc. The matchup Alistar vs Renata Glasc occured 9 times. Renata Glasc has 4 wins and 5 losses in this matchup. Learn how to counter pick Alistar to get another perspective on the data.
Lane outcome for Renata Glasc
When looking at Renata Glasc 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 Renata Glasc. The lane outcome of Renata Glasc consists of three outcomes: Win, Loss or Draw. Let's take a look of Renata Glasc 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 Renata Glasc.
Conclusion
Analyze the available data and learn how to beat Renata Glasc. To master Renata Glasc take also a look on Renata Glasc builds and runes for Renata Glasc. Good luck, Summoner!