The Celtics are still waiting for a challenger to emerge in the East,

BOSTON — Is anyone in the Eastern Conference going to give the Celtics a series?

The Cleveland Cavaliers took their first shot of the second round, and it did not go well. They got 33 points from All-Star guard Donovan Mitchell and too little too late from anyone else in Game 1’s 120-95 loss at TD Garden. That might be enough to sneak past the Orlando Magic, but Boston is a different animal.

It felt like the Celtics could get anyone in double digits if they wanted. Jaylen Brown scored 15 of his 32 points in the opening quarter. Derrick White added 14 of his 25 in the third. Jrue Holiday and Payton Pritchard combined for 30. They hardly needed Jayson Tatum, who did not shoot well, has yet to be spectacular in these playoffs and still compiled 18 points, 11 rebounds and five assists on the night.

They do not even have Kristaps Porziņģis.

“We’ve got a lot of threats on our team with the addition of Porziņģis, with the acceleration of Derrick White, and that means a lot of guys are going to have it going,” said Brown, who finished 12-for-18 from the field. “When I get it, I need to be efficient with the opportunities that I have. We have a lot of different guys who can do a lot of different things, and I’ve only empowered that. I think that’s made us a better team, but it’s also made me more efficient. When I get the ball, I want to be as lethal as possible.”

The atmosphere inside TD Garden resembled a hyped regular-season game and has since the playoffs began. Even when the Miami Heat stole Game 2 in Boston, nobody really believed a Jimmy Butler-less roster presented a challenge. The way the rest of that series went — blowout after blowout — the Celtics were just gifting legendary play-by-play man Mike Gorman the courtesy of one final home broadcast.

Gorman, sitting courtside on Tuesday, got the biggest ovation of the night, as the Celtics showed him on the Jumbotron. The next-biggest cheer came at the end of the third quarter, when Pritchard drilled a…