As noted by John Hollinger of The Athletic, Boston became the first city to have BOTH its hockey and basketball team lose a Game 7 at home to an eighth-seeded opponent in the same season.

Source: https://www.boston.com/sports/boston-celtics/2023/05/30/bruins-celtics-playoffs-game-7-panthers-heat-loss-td-garden/

Brendan Nakashima beat Bernabe Zapata Miralles 6-1, 7-6 (3) and will play third-seeded Holger Rune in the second round, while Yoshihito Nishioka defeated Daniel Altmeier 6-4, 3-6, 7-6 (2) to set up a meeting with eighth-seeded Casper Ruud.

Source: https://wtop.com/sports/2023/10/iga-swiatek-advances-to-quarterfinals-at-china-open-jessica-pegula-eliminated/

In the first round, Georgetown put up an impressive defensive performance to push past the eighth-seeded Butler Bulldogs (11-19, 6-14 Big East), winning 53-46.

Source: https://thehoya.com/womens-basketball-hoyas-improve-to-14-17-record-fall-39-69-to-uconn-in-big-east-quarterfinals/

The eighth-seeded Heat are on the brink of elimination after Friday’s 108-95 loss in Game 4, falling into a 3-1 hole as the series heads back to Denver.

Source: https://krdo.com/news/ap-colorado/2023/06/10/heat-on-the-brink-of-elimination-appear-to-be-running-out-of-playoff-magic/

The Huskies dominated the eighth-seeded Arkansas Razorbacks Thursday night, 88-65.

Source: https://www.wgmd.com/members-of-uconn-basketball-have-belongings-stolen-from-team-bus-during-practice-shortly-after-hotel-debacle/

The largest betting postseason upset in NBA history was the eighth-seeded Nuggets beating the top-seeded Seattle Supersonics in the first round of the 1994 NBA playoffs as 14-1 underdogs.

Source: https://nesn.com/bets/2023/04/where-heats-first-round-upset-over-bucks-ranks-in-nba-history/

The Nets play two Eastern Conference playoff opponents: the eighth-seeded Atlanta Hawks on Friday, and the championship-chasing Philadelphia 76ers in the April 9 season finale.

Source: https://www.bostonherald.com/2023/03/30/nets-late-rally-vs-rockets-both-concerning-and-promising-for-team-with-playoff-hopes/

They still believed they were the better team than the eighth-seeded Heat.

Source: https://www.bostonherald.com/2023/05/25/celtics-storm-to-dominant-game-5-victory-over-heat-force-game-6-in-miami/