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Boston Celtics star Jaylen Brown's stats without Jayson Tatum playing could determine Game 7 versus the Philadelphia 76ers.

Jayson Tatum is not playing for the Boston Celtics against the Philadelphia 76ers in Game 7 after an initially unclear injury situation was officially listed as “left knee stiffness.” That puts the Celtics’ season directly in Jaylen Brown’s hands and shifts the Celtics’ starting lineup.

Tatum was ruled out shortly before Boston’s winner-take-all matchup with Philadelphia, turning what was already a tense Game 7 into a referendum on whether Brown can carry the Celtics without their other franchise star.

For Boston, the good news is that Brown has already spent most of this season operating without Tatum. The bad news is that this is no longer a regular-season test case. This is Celtics-Sixers, Game 7, with the season on the line.

Jaylen Brown’s Stats Without Jayson Tatum

Brown’s numbers without Tatum this season are strong enough to make Boston believe it still has a path.

According to StatMuse, Brown averaged 28.9 points, 7.2 rebounds and 5.1 assists in 58 games without Tatum during the 2025-26 season. He also shot 47.6% from the field, 34.9% from three-point range and 77.6% from the free-throw line, with a 56.8 true shooting percentage.

That is not just “score more because Tatum is out” production. The assist number is the important part for Boston.

Without Tatum, Brown has to be more than a downhill scorer. He has to initiate offense, punish Philadelphia when the Sixers send help, keep Derrick White and Payton Pritchard involved and make sure Boston’s spacing does not collapse around him.

The matchup also has some direct relevance against Philadelphia. StatMuse’s game log shows Brown had 25 points, 6 rebounds and 4 assists against the Sixers on October 22, 2025, one of Boston’s games this season without Tatum.

The Celtics do not need Brown to imitate Tatum. They need him to bend the Sixers’ defense enough to create the same downstream effects: open threes, weak-side cuts, offensive rebounds and fewer late-clock possessions where Boston is simply trying to survive.

Jayson Tatum Is Out With Left Knee Stiffness

Tatum’s absence is the defining development of Game 7.

The Celtics initially had reason to hope he would play. Reuters reported earlier Saturday that Tatum had been listed as questionable with left knee stiffness and that he expected to play, with Celtics coach Joe Mazzulla also saying Tatum would be available at that stage.

That changed before tipoff.

The timing is brutal for Boston. Tatum had averaged 23.3 points, 10.7 rebounds and 6.8 assists in the series, and his size gives the Celtics a pressure point Philadelphia has to account for on every possession.

Now, the burden shifts. Brown becomes the first option. White likely handles more late-clock offense. Pritchard becomes even more important as a shooter and secondary creator. Boston’s frontcourt has to screen, rebound and finish without expecting Tatum to bail out broken possessions.

That is why Brown’s no-Tatum sample matters. It is not a perfect predictor for Game 7, but it is the clearest evidence the Celtics have that their offense can still function without Tatum.

Celtics Starting 5 Tonight

The Celtics had not officially announced their starting lineup at the time of publication, but the most reasonable projection is:

Derrick White, Jaylen Brown, Sam Hauser, Baylor Scheierman and Neemias Queta.

Before Tatum was ruled out, multiple projected lineups had Boston starting White, Brown, Hauser, Tatum and Queta. Yahoo Sports listed that as the probable starting group earlier in the day, and College Football Network also projected the same five before the Tatum update.

With Tatum out, the cleanest replacement is either Scheierman or Jordan Walsh. CelticsBlog identified Scheierman, Walsh and Pritchard as the likely candidates to move into the starting lineup if Tatum could not play.

Scheierman makes sense if Mazzulla wants to preserve spacing and size. He has already had a notable role this season, and StatMuse lists his best game of the year as a 30-point, 7-rebound, 7-assist performance against the Orlando Magic on April 12, when he played 39 minutes and hit six threes.

Pritchard is another logical option if Boston wants more ballhandling, but starting him would create a smaller group against a Philadelphia team with Tyrese Maxey, Paul George and Joel Embiid. Walsh would give Boston more defense and athleticism, but Scheierman’s shooting may be more valuable next to Brown.

Either way, the Celtics’ formula is obvious. Brown has to be the best player on the floor for long stretches, White has to stabilize the offense, and Boston’s replacement starter cannot become someone Philadelphia ignores.

That is why Brown’s numbers without Tatum are not just trivia. They may be the difference between Boston advancing and the Celtics’ season ending without their biggest star.