Per Wikipedia:
Upsets happen in the women's tournament much like in the men's tournament. For example, the only #16 seed to beat a #1 seed occurred in the women's tournament in
1998, when
Harvard defeated
Stanford 71-67 at Stanford. (Stanford's team had two starters unable to play because of torn
ACLs [1].) That feat has never occurred in the men's tournament. Still, the women's tournament is characterized by fewer upsets than in the men's tournament. No 14th- or 15th-seeded team has ever advanced to the second round, which has occurred in the men's tournament 18 times (or 11% of the time). The 13th seed has won its first round game 8% of the time, compared to 22% of the time in the men's tournament.