Bullish Celtics outlook includes Jayson Tatum change, Joe Mazzulla's historic edge

There are two truths about the outlook on the Boston Celtics upcoming season. One is that their roster is more talented than it was in the 2025-26 campaign. The other is that they'll probably finish with fewer than 56 wins, after reaching that mark while defying expectations a year ago.

Let's ruminate on the former before diving into the latter.

Jaylen Brown -- whose return to Boston is one of the need-to-know dates on their schedule -- led a group that was without Jayson Tatum for most of last year. Now, it's the latter's turn to operate the helm without the other half of a duo that delivered one of the most successful eras in franchise history.

Jayson Tatum’s new frontier: Life without Jaylen Brown

Can Tatum at least match the campaign his former running mate is coming off? Brown finished sixth in the MVP voting. He averaged 28.7 points, 6.9 rebounds, 5.1 assists, 1.0 steals, and shot nearly 50 percent from the field.

What Tatum demonstrated upon returning from his Achilles tear is that he's capable of reclaiming his status as a first-team All-NBA talent. And that was while playing with a strength deficit between his recovering leg and his healthy one, and not suiting up until March. Now, he has an entire offseason to build on his re-established foundation.

What he gained from those 22 tilts is peace of mind. They assuaged fears and answered questions. That doesn't just bring tranquility; it adds fuel to the fire for someone whose desire to be great was captured by how quickly they returned to the court after a devastating injury.

Moving down the roster, there's room for Payton Pritchard to make a leap. It's more likely than not that Derrick White will recapture his form from beyond the arc. But even if he doesn't, he's coming off a campaign where he earned a spot on the All-Defensive First Team. And whether you agree with Kenny Atkinson's assessment or not, White's performance prompted the Cleveland Cavaliers' head coach to declare him a top-five player in the league.

And while growth isn't always linear, what might this season hold for Boston's burgeoning wings? Hugo Gonzalez could ascend. Jordan Walsh is working on an offensive evolution. Baylor Scheierman has followed up a breakout year by transforming his physique. And Ron Harper Jr. has quickly reaffirmed why the franchise extended him a new, multi-year contract, spending most of his summer honing his craft at the Auerbach Center.

But the reasons for optimism about what the 2026-27 campaign might look like in Boston go beyond who's on the roster.

Joe Mazzulla's historic track record gives the Celtics an edge

Boston's bench boss boasts the highest regular-season winning percentage by any head coach in NBA history.

Mazzulla is 238-90 [a 72.6 percent win rate] in his four years in the A chair. That's a testament to an organization, not just one individual, but it's a crucial context. And when considering how he built that record, don't forget how he inherited the job, getting thrown into the fire right before training camp. He also had to navigate last summer's scale-down.

The Johnston, Rhode Island, native's ability to handle whatever's thrown at him and help the Celtics remain a top team in the East is a feat that suggests those who are down on them entering next season should make sure their stance is properly measured.

Their head coach doesn't just have history on his side. He now has a roster that's tailored to "Mazzulla Ball."

Paul George and Mike Conley take care of the ball; they're effective 3-point shooters, and they force turnovers. They're a clean fit. To say Mitchell Robinson is a beast on the boards might not be doing him justice.

While the initial plan is for Neemias Queta to remain the C's starting center -- the best course of action -- when Boston's prized free-agent pickup enters the fray, he'll have a significant hand in helping them win the possession battle. He'll also bring more to the table than often gets discussed.

Tatum's the tip of the spear. He's among the NBA's most malleable stars. But now, he and the supporting cast are especially suited to each other. He is surrounded by reliable kick-out options, lob threats, partners to run two-person actions with, and a group who will repeatedly extend possessions. On the other side of the ball, adding Robinson and George should help this team maintain a spot among the top five in defensive rating.

It's a cohesive roster, functioning within the system of a head coach with a historic track record.

That's a well-designed setup to keep the Celtics among the top teams in the East -- even with the changes to the NBA landscape.

Celtics' 2026-27 season outlook: Fewer wins for a better team

While Boston will return next season with a more talented roster, matching last year's record is unlikely.

There's stiffer competition across the Association, and teams are less incentivized to tank. The NBA's lottery reform won't eradicate that issue, but now, organizations will want to avoid sinking to the bottom of the standings. That raises the floor. There was also a pack of franchises jockeying for favorable draft position to land a top prospect in this year's star-studded class. It's early, but understandably, there's considerably less hype when looking ahead to next June's draft.

Of course, it's not just that some of the worst teams last season, like the Washington Wizards, procured a rookie like top-overall pick and Massachusetts native AJ Dybantsa.

The Eastern Conference is a gauntlet

The Celtics now must contend with Brown and LeBron James joining Tyrese Maxey, Joel Embiid, and VJ Edgecombe in Philadelphia. The New York Knicks return from their trip to the NBA summit with nearly their entire title team intact.

The Miami Heat, who the C's will square off against in a Christmas clash, won the Giannis Antetokounmpo sweepstakes. The Detroit Pistons added more shooting and will most likely retain Jalen Duren. When Boston faces the Toronto Raptors, Kawhi Leonard figures to be on the other side of that matchup. The two-time Finals MVP is coming off one of his most productive seasons.

The Indiana Pacers, the East's Finals representative in 2024-25, get Tyrese Haliburton back. They also have a new partner for him at the pivot after acquiring Ivica Zubac at February's trade deadline.

The Cleveland Cavaliers -- who should regret not paying the price to bring LeBron James home -- are still returning a core quartet that got them to the Eastern Conference Finals in May. That's, of course, operating under the presumption that a deal gets finalized with James Harden.

The Atlanta Hawks, who Boston will face in the NBA Cup group stage, added Luguentz Dort to an already-stingy defense. They also selected promising prospect Kingston Flemings with the No. 8 pick in this year's draft.

From the Charlotte Hornets swapping LaMelo Ball for Naz Reid -- giving the keys to Brandon Miller and Kon Knueppel -- to what the Orlando Magic's new head coach Sean Sweeney could do for Paolo Banchero and Franz Wagner, the list goes on.

The Celtics still project to finish as one of the top teams in the East. However, this is a more treacherous road to navigate than it was a year ago. A coach with a historic regular-season track record, a roster built to thrive in his system, and a star surrounded by a deep supporting cast, finely tuned to work in harmony with him, are all reasons to be bullish on Boston's upcoming campaign.

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