In the 10 NCAA Tournaments prior to this one, 34 of the 40 number 1 seeds have reached the Sweet 16. Of the eight teams that have won by 20+ points, six of them have reached the Final Four (75%). No #1 seed won by over 20 this year.
Of the 13 teams that have won their second round game by under 10 points, just two have reached the Final Four (15%). Florida and Ohio State would fall into this category.
There have been 21 teams that have won by 10 or more, with 14 of them reaching the Final Four (67%). This would be KU and UNC.