Don't know if everyone can read the entire story, but the crux of the article is that in the past 40 upsets (defined as a team five or more slots below its opponent winning) the key to winning the game is turnovers.
For each upset, we compared the teams involved by their performance in two dozen categories. The majority of these comparisons were based on how the teams matched up—for instance, how well one team shot three-pointers during the season and how well their opponents defended against them. The same head-to-head comparisons were made for factors like rebounding and steals.
In the end, we found a few strong similarities between all of these matchups. But there was only one unequivocal theme: the importance of turnovers.
In the end, we found a few strong similarities between all of these matchups. But there was only one unequivocal theme: the importance of turnovers.

