Analyzing how Sunday’s outcomes will decide who the Celtics face in playoffs

The Celtics clinched the East’s top seed on Mar. 25 and the NBA’s best record on Apr. 4. They’ve sat back since, playing out the schedule some nights, resting on others. Fans have watched with intrigue as the first round scenarios narrowed slightly each night.

“The next time we get on the plane, we mean business,” Jayson Tatum said mic’d up before Boston’s final road game at Milwaukee. “Where are we going? Are going down to Miami? Are we going back to Brotherly Love? Are we gonna go to Indiana?”

“Atlanta?” Derrick White said. “Chicago?”

As it stands, the seventh-seed 76ers would host the Heat in the 7-8 Play-In game on Tuesday, with the loser advancing to play the winner of the Hawks-Bulls single elimination matchup. With Atlanta-Chicago locked in and set for Wednesday, the Hawks and Bulls share a roughly 20% chance each of grabbing the eight seed, according to Basketball Reference.

The Heat and Sixers have flip-flopped as the favorite to meet Boston for weeks, settling on 24.3% in favor of Miami on Friday when Philadelphia moved into a three-way tie for fifth. Miami also has the chance, though far less likely, to avoid the Play-In round with a win and some help on Sunday. The Magic and Pacers — fifth and sixth in the standings due to Orlando’s lead atop its division and Indiana’s head-to-head tiebreaker over Philadelphia — could fall into seventh or eighth, and in position to play Boston in the opening round.

That creates the following mind-numbing amount of scenarios:

Let’s go game-by-game through the Sunday schedule and assess what’ll take place during and after Boston finishes its season at home against Washington at 1 p.m.

Hawks-Pacers, 1 p.m.

Atlanta is missing Jalen Johnson and Onyeka Okongwu, and while Clint Capela could rest, Trae Young will play his second game since returning from hand surgery. The Hawks are locked into the 10th seed with nothing to play for.

The Pacers, sixth in the East, lead Miami by 1.0 game in a three-way tie for fifth with Orlando…