College basketball rankings: Even unranked teams find success in the NCAA tournament
Since the NCAA tournament expanded to 64 teams in 1985 — its modern format — only four of 37 national champions were unranked to start the season. That’s about one in every nine years.source https://www.ncaa.com/news/basketball-men/bracketiq/2023-03-11/college-basketball-rankings-even-unranked-teams-find-success-ncaa-tournament