Celtics Shake Off N.B.A. Finals Loss With Season-Opening Win

BOSTON — The Celtics talked an awful lot in training camp about the value of experience. Last season, they got loads of it by surviving a brutal start, and by ousting intergalactic celebrities in the early rounds of the playoffs (Kevin Durant, Giannis Antetokounmpo) before advancing to the N.B.A. finals.

The process made them tougher and wiser, with a reservoir of resilience that may have equipped them to handle the news, essentially on the eve of camp last month, that their coach, Ime Udoka, had been suspended for the season for violating team policies. His sudden absence could have been disruptive.

Instead, the Celtics seemed to rededicate themselves to their singular goal of winning a championship. Why not them? Jayson Tatum and Jaylen Brown are two of the league’s brightest stars. The team’s supporting cast includes Marcus Smart, last season’s defensive player of the year. And if Joe Mazzulla, the team’s 34-year-old interim coach, is daunted by the task ahead of him, he hardly showed it Tuesday night as the Celtics opened their season with a 126-117 victory over the Philadelphia 76ers.

“These guys have been through a lot together,” said Mazzulla, whose players celebrated his first career N.B.A. coaching win by dousing him with water.

The last time the Celtics played a meaningful home game was back in June, when Golden State’s Stephen Curry gave them the business — yes, the business — in Game 6 of the N.B.A. finals. Curry left Boston with another championship, and Tatum and Brown were left to contemplate how they could take the next step.

“We both had bad summers after losing to the Warriors on our home floor,” Brown said. “Having to answer for it all summer long — it was tough. So going into this season, we kept all of that in mind.”

On Tuesday, Brown and Tatum each scored 35 points to eviscerate the 76ers, who have title dreams of their own. Brown shot 14 of 24 from the field, while Tatum shot 13 of 20 and grabbed 12 rebounds. The Celtics used their speed to run the 76ers off the parquet floor, outscoring them by 24-2 in transition.

“I think the group that was together last year knew how they wanted to approach this year,” said Malcolm Brogdon, who scored 16 points off the bench in his Celtics debut after they traded for him in July. “And I think playing with pace was one of the things they wanted to improve.”

It can be easy to read too much into training camp and season openers. Most teams have high hopes. Optimism runs amok. The Celtics are no different. For weeks, the players have expressed confidence in Mazzulla, who joined the Celtics as an assistant in 2019 and whose only previous head coaching experience was at Fairmont State, a Division II program in West Virginia.

For now, at least, Mazzulla has gotten the players to buy into his message — by striking that delicate balance between being demanding of them while giving them the freedom to do what they do best, Brogdon said. The Celtics appear determined to play hard and play fast. Catch them if you can.

Their opener against the 76ers was an immediate litmus test.

“I’m not sure what you learn,” Doc Rivers, the coach of the 76ers, said before the game. “Opening night is its own beast. Guys have worked all summer to show not only us but everyone what they’ve done, what they’ve worked on. And as a coach, you want to make sure they don’t show everything — because they may not be ready to show that.”

Remember: The Celtics were 18-21 at one point last season before they found their footing under Udoka. With that in mind, plenty can happen between now and June, or even between now and December.

“It’s just one game,” Brown said.

For the players this season, there will be constant reminders of the franchise’s illustrious past. On the team’s home court, silhouettes of the number 6 fill both lanes — a homage to Bill Russell, the iconic Celtics center who died in July. Tuesday’s game was preceded by a ceremony to honor him that included remarks from Brown — “Our gratitude is endless,” he said — and a new work by Porsha Olayiwola, Boston’s poet laureate.

The Celtics wore special jerseys embroidered with 11 diamond patches, a nod to the 11 championships that the team won with Russell. And the script on the front of the jerseys was said to be inspired by the aesthetics of Slade’s Bar & Grill, which Russell owned in the 1960s. In their pregame huddle, the Celtics reminded one another to “honor the man” with their work that evening.

The Celtics made some modest changes over the summer, trading for Brogdon and signing a twilight-era Blake Griffin, both of whom received big cheers when they entered the game in the first quarter. Griffin immediately endeared himself to the crowd by grabbing two offensive rebounds on his first possession.

The entire team was surprisingly sharp, committing just 11 turnovers while shooting 56.1 percent from the field. They were also without Robert Williams, their starting center, who underwent knee surgery last month, and they should be even more fearsome when he returns.

In his absence, a conga line of teammates took turns mixing it up with Joel Embiid, Philadelphia’s All-Star center. Early in the third quarter, Embiid got tangled up with Smart, who said he stopped himself from escalating the situation. (Again, meet the older, wiser Celtics.)

“It’s maturity,” Smart said. “I could’ve cracked his head open, but I didn’t.”

In the waning seconds, as the crowd began a familiar chant — “Let’s go, Celtics!” — Mazzulla allowed himself to savor the moment.

“When they’re cheering for you,” he said, “it means you’re doing something right.”