Atlanta's De'Andre Hunter celebrates a 3-pointer during the Hawks' comeback win over the Celtics in Atlanta on Monday night. (AP photo)

ATLANTA (AP) — De’Andre Hunter scored 24 points, including a clinching 3-pointer with 9.2 seconds remaining, and the patched-together Atlanta Hawks rallied from a 30-point deficit Monday night for a stunning 120-118 victory over the NBA-leading Boston Celtics.

The Celtics had won 20 of 22 and brought a nine-game winning streak into State Farm Arena — a run that certainly appeared in no jeopardy when Al Horford’s 3-pointer put Boston up 68-28 with just under 4 1/2 minutes left in the first half.

But the Hawks, clinging to the final play-in spot in the East and one of the league’s most disappointing teams, launched a comeback out of nowhere with All-Star guard Trae Young and three other key players sidelined by injuries.

Dejounte Murray put the Hawks ahead to stay at 117-116 on a reverse layup with a minute left. Jaylen Brown missed a desperation 3 with the shot clock expiring, and Hunter sealed things at the other end with a huge assist from Clint Capela.

After Murray missed a jumper, Capela grabbed the offensive rebound and spotted Hunter all alone at the top of the key. Even though the shot clock was off and Hunter could’ve forced the Celtics to foul, he let go an open look from 26 feet.

Nothing but net.

The Celtics managed one more basket off an offensive rebound, but the Hawks ran out the final 1.5 seconds to pull off their most improbable win of the season against a team that came into the night 25 1/2 games ahead of them in the Eastern Conference standings.

Atlanta’s comeback began with a 9-0 run to end the first half, which cut the deficit to 74-56 as the teams headed to the locker room.

The momentum carried over to the third quarter, which began with Atlanta ripping off 19 of the next 23 points to slice the margin to 78-75.

After the Celtics flirted several times with pulling away again, the Hawks finally claimed their first lead of the night when little-used Wesley Matthews knocked down a 3 to make it 97-96 with 9:42 remaining.

Bogdan Bogdanovic had 22 points and Murray chipped in with 19, but it was several players who are normally buried deep on the bench who really carried the Hawks.

Vit Krejci had 16 points, including a 3-pointer that left him shrugging his shoulders toward his teammates as if he couldn’t really believe what was happening. Bruno Fernando had 13 points and Matthews knocked down a pair of crucial 3s.

The Celtics lost despite 37 points from Jayson Tatum. Brown added 24.

With plenty of fans in green cheering them on in Atlanta, the Celtics doubled up the home team in the first quarter by racing to a 44-22 lead.

Boston made 16 of 24 shots in the opening period, including 5 of 7 beyond the 3-point arc, in addition to going 7 of 7 at the foul line.

Tatum finished the half with 23 points, four rebounds, four assists, two steals and a blocked shot.

UP NEXT

Celtics: With a strange quirk of scheduling, Boston will get an extended stay in Atlanta before the same teams meet again on Thursday.

Hawks: Atlanta has another home game against the Portland Trail Blazers on Wednesday, sandwiched between its two contests against the Celtics.