Good example thereDistance running?
I was about to compare it to the other sport I played, wrestling. I noticed a big difference of who could really rise up the ranks and get opportunities in college, after just picking up the sport in high school. Starting young though, I really do think it's possible to get into a good D3 school for tennis as long as you have someone to play with growing up. Even just picking it up in high school you can get opportunities to play at many D3 schools. I have no idea past that as I couldn't really dream to play D1 anywhere for anything.