This study has been written in French during my graduation there in 2012. For the none French readers, you can have a look at maps and charts of the first part : it shows out out which are the best countries producing ATP and WTA pro players, how many players there are in each countries, what is the history of tennis and where does it has been played first and then. There is also statistics about the tennis development in France, in a political, sociological and geographical approach.
Have a look at this tennis development study below , I hope you will enjoy this reading that helped me a lot to understand many aspects of our game.
Cheers,