I assumed everyone had been reading all this with bated breath. LOL....
I'll start from the assumption you know how the NCAA hoops tournament works. Tennis is similar, but not the same. There are a bunch of "regionals", which are really mini-regionals.
Here's the bracket from last year, for example:
NCAA 2016 men's tennis bracket
Only 4 teams go to a "regional", and each one of those is seeded 1 thru 4. ETSU has most often gotten a 4 seed, but twice(??) a 3 seed, once being last year, when we gave Michigan a battle. Overriding that.....there are overall seeds, as you can see from the bracket, and teams not seeded 1-16 overall, are placed in the mini-regionals near (somewhat) their site, and against an appropriate counter-seed. You can tell that since neither Michigan or ETSU got an overall seed, they were not in the top 16, and in fact since it was a 3 vs. 4, neither would have been seeded (overall) in the top 32. There are 64 teams overall, like there used to be until recently in hoops. There likely is an overall 1-64 'ranking', but to my knowledge that's not publicized. Maybe the coaches get to know them, don't know.
For the girls.....since last year was one of the rare appearances for ETSU, here's their bracket. Since ETSU, even at 20-2, was considered a weak team (compared to the whole country), they had to go up against overall #3 seed UNC, with the expected result.
NCAA 2016 Women's tennis bracket
The best seed we've (the guys) ever gotten is a 3. Which I think we've done twice. *Maybe* thrice. The ITA (Intercollegiate Tennis Association) currently does the ranking, for both teams and individuals. They only rank the teams thru #50 right now. I think they, or the NCAA, or somebody, used to rank thru 100, but not anymore. For example, I think when we played Vandy in the 2013 tournament, we were 'ranked' 70th. In 2011, we were 'ranked' 55th, were a 3 seed, and almost almost almost upended Notre Dame. We were a strong team that year.
But apparently the NCAA still 'ranks' them at least internally, in order to do the seeding. I'm guessing they have access to ITA's database, which is computerized. Since ETSU isn't ranked in the top 50, I'd say we'll get a 4 seed - BUT....we played both Ga. St. and UCF close, and they're ranked 37th and 31st, respectively. So there's an *outside* chance we'll get a 3, especially since we've won a couple of matches in the past (and played Michigan close last year) - although that won't count for much. And who knows - maybe we'll get some cred for how well our doubles team did last Spring? The rankings *may* be updated once more before the seeding is announced. They should be, and probably are going to be.
When we beat Alabama in the first round in 2010, I *think* we were a 3 seed, but am not positive. We lost the next day to UT, who had 5 ranked guys on that team, including John-Patrick Smith, who was ranked #1 (and has now won something like $700K on tour). When we beat Notre Dame in 2008, I kinda think we were a 4 seed, but am far from sure on that. THEN....as I'm sure you'll all remember because I posted extensively on it at the time.....we lost to Ohio St., and it would have been even closer had it not been raining and had to be moved indoors *on their home courts* during the match.
And btw, I assume you know this, but after the team competition, there are individual competitions, for both singles and doubles, which is where Ribeiro and Biosca excelled last year, as you likely remember. But as a refresher:
Ribeiro's and Biosca's historic run last year
That's probably *more* than you wanted to know, but if you have further questions, ask....