In a significant turn of events, Boston Celtics superstar Jayson Tatum was officially ruled out of Game 7 of the Eastern Conference quarterfinals against the Philadelphia 76ers, less than two hours before tipoff. The cause for his absence was left knee stiffness, a designation that surprised many given the Celtics' previous assertions that he had no issues after their Game 6 loss. Celtics coach Joe Mazzulla confirmed the decision during his pregame media availability, stating, "He just came in today with knee discomfort. And we decided, the medical staff and myself, that he would not play." Mazzulla indicated that Tatum was experiencing discomfort behind his knee and was considered day-to-day, but he declined to name a replacement starter.

Tatum had initially been listed as questionable with the same left knee stiffness six hours prior to the game. This left knee issue is distinct from a torn Achilles in his right leg he sustained last May, from which he made a strong return in March, quickly regaining his status as one of the league's top players. However, it was his left leg that became a concern during Boston's 106-93 loss to Philadelphia in Game 6, where he left the court with 4:03 remaining in the third quarter. Although he later returned to the bench in the fourth quarter, Mazzulla opted not to reinsert him into the game as Boston trailed by more than 20 points. Both Tatum and Mazzulla had downplayed any knee issues immediately after Game 6.

Saturday's Game 7 carries immense historical weight. This marks the 23rd playoff series between the Celtics and the 76ers, making it the most frequently played postseason rivalry in NBA history. Boston boasts an impressive record against Philadelphia in the playoffs, having won six consecutive series stretching back to 1982, the last year the 76ers claimed an NBA title. Furthermore, the Celtics, often led by Tatum, have been a consistent playoff nemesis for Joel Embiid, eliminating him three times: in the 2018 conference semifinals, a 2020 first-round sweep, and a grueling second-round series in 2023 where Boston rallied from behind to win Game 6.

The current series dynamics add another layer of historical significance. Boston had initially taken a commanding 3-1 lead, a scenario in which they hold a flawless 32-0 record in best-of-seven series throughout their history. The 76ers, conversely, face an uphill battle, as they are 0-18 when trailing 3-1, the worst mark in NBA history. After Philadelphia won Game 5 in Boston and Game 6 back in Philly, the stage is set for a pivotal Game 7, with the Celtics now facing it without their star player.