On Sunday, the N.C.A.A. selection committee set the field for the men’s tournament. The four No. 1 seeds, in order, are Virginia, Villanova, Kansas and Xavier.
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Xavier earned their first No. 1 seed in school history, giving the Big East two of the top seeds in the tournament. They will need to look out for Gonzaga, though, as the No. 4 seed and a possible Round of 16 matchup. North Carolina is the No. 2 seed in the region.