http://www.ncaa.com/content/di-principles-and-procedures-selection*Each of the first four teams selected from a conference shall be placed in different regions if they are seeded on the first four lines.
*Teams from the same conference shall not meet prior to the regional final if they played each other three or more times during the regular season and conference tournament.
*Teams from the same conference shall not meet prior to the regional semifinals if they played each other twice during the regular season and conference tournament.
*Teams from the same conference may play each other as early as the third round if they played no more than once during the regular season and conference tournament.
*Any principle can be relaxed if two or more teams from the same conference are among the last four at-large teams selected to the field to participate in the First Four.
*To recognize the demonstrated quality of such teams, the committee shall not place teams seeded on the first four lines at a potential “home-crowd disadvantage” in the second
round.
*Teams will remain in or as close to their areas of natural interest as possible.
*A team will not be permitted to play in any facility in which it has played more than three games during its season, not including exhibitions and conference post-season tournaments.
*A team may be moved up or down one (or in extraordinary circumstances) two lines from its true seed line (e.g., from the 13 seed line to the 12 seed line; or from a 12 seed line to a 13 seed line) when it is placed in the bracket if necessary to meet the principles.
*If possible, rematches of non-conference regular-season games should be avoided in the First Four and second round.
*If possible, after examining the previous two years’ brackets, teams or conferences will not be moved out of its natural region or geographic area an inordinate number of times.
*If possible, rematches from the previous two tournaments should be avoided in the second round.