Tennis, as an individual sport, is all about rankings. As terrific an athlete you may be, most college programs won't even give you the time of day if you don't have extensive USTA experience, and yes, a ranking.

If you rank outside of the top one hundred, consider yourself an exception to the rule if you receive an offer from a Division-I program. Outside of the top 250, you'd be lucky to land a spot at a competitive D-II or D-III school. If you rank beyond 450, your options are even more limited; you might only have what it takes to make a lower-tier D-II, D-III, or junior college team (source).

Unless you were too busy winning back-to-back-to-back state championships to bother registering for the USTA, consider yourself in a world of trouble.

Academically speaking, of course, you're going to have to get into college if you want to play in college. Fortunately, there are plenty of top-notch junior colleges that are renowned for their tennis programs. Avenues like that can help you get into a four-year school where you can potentially then land some scholarship dough (if you don't have the grades, or scores, or tuition money in the first place).

Finally, most colleges are not permitted more than 9 or 10 roster spots per team, so the competition will be stiff (source). You should be doing everything you possibly can, academically as well as athletically, to make yourself as attractive as possible to a college.