The closest anyone has ever gotten in predicting a perfect NCAA Basketball bracket, that is known publicly, is an astounding 58 of 63 games (or lines) correct. This was done by a Yahoo entrant, according to a Yahoo spokesperson in this FiveThirtyEight article.
Learn more about the longest perfect bracket streak at NCAA.com.
The odds of picking a perfect bracket in the NCAA men's basketball tournament are really, really small. So small, in fact, that many mathematicians differ on the actual estimation of the odds.
Some believe it's as low as 1 in 9,223,372,036,854,775,808 (or 1 in 9.2 quintillion, for those who skipped the last 18 digits), while others, including Jeff Bergen, a professor at DePaul, think it's as "high" as 1 in 128 billion. Either way, picking all 63 games (excluding the First Four games) correctly is next to impossible.
Find out how many people picked a perfect Final Fourat NCAA.com.