Draft:List of eighth-seeded teams that have upset number one seeded teams

This list of eighth-seeded teams has upset number one seeded teams in sports.

National Hockey League
Only one of those eighth-seeded teams would win the Stanley Cup. All of these upsets happened on or before the 2013 Stanley Cup playoffs, as the playoff format switched after that.

Successful upsets
As of the end of the 2023-24 NBA season, six eighth-seeded teams have eliminated their number one seeded opponents.