Number of players total does not prove anything? You are talking about the country which currently boasts the largest population, of course they are going to have a large presence in almost everything they do, welcome to statistics?

Again, if is sooooo popular, how come you can't even fill the WTA final of 10k people, hosted in one of the largest cities in the world by population? Surely you can find 10k people out of the "14m tennis enjoyers" to fill a stadium? Not counting the seats that's already filled by foreign fans?