How to counter Rumble
Let us take a look on how to beat Rumble. We will look at champions who are strong against Rumble and who are weak against Rumble. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Top champion who counters Rumble. You can already win in champion select with the right counters for Rumble. If you want to know how to counter Rumble then you need to take into account the best picks vs Rumble and the worst picks vs Rumble. This Rumble counter data is based on matches played by Pros on patch 14.22 and previous ones. It is important to see whether Pros counter picked Rumble or whether they played as Rumble.
Champions used by Pros to counter pick Rumble
Looking at the matches from Pros (see table Pros counter picked Rumble) we can see that they picked 
Gnar most often to counter pick Rumble. The matchup Gnar vs Rumble occured 13 times. Rumble has 8 wins and 5 losses in this matchup. Learn how to counter pick Gnar to get another perspective on the data.
Lane outcome for Rumble
When looking at Rumble 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 Rumble. The lane outcome of Rumble consists of three outcomes: Win, Loss or Draw. Let's take a look of Rumble 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 Rumble.
Conclusion
Analyze the available data and learn how to beat Rumble. To master Rumble take also a look on Rumble builds and runes for Rumble. Good luck, Summoner!