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Milwaukee Bucks’ Giannis Antetokounmpo dunks during the first half of Game 4 of an NBA first-round play-off series against the Boston Celtics on Sunday. Image Credit: AP

Milwaukee: After losing a 20-point lead to the Boston Celtics, the Milwaukee Bucks were determined not to lose another play-off game.

Leave it to All-Star forward Giannis Antetokounmpo to come up with a big play in the final seconds on Sunday.

Antetokounmpo scored 27 points, including tipping in the go-ahead basket with 5 seconds left, and the Bucks held on for a 104-102 win to tie their first-round play-off series at two games apiece.

Boston’s Marcus Morris missed a 14-footer at the buzzer with Khris Middleton’s hand in his face to seal a nail-biting win for the Bucks.

Seconds earlier, the 6-foot-11 Antetokounmpo jumped and reached up with his left arm around Boston’s Jayson Tatum to put back Malcolm Brogdon’s missed layup for the game-winner.

“It’s a heck of play,” coach Joe Prunty said.

Game 5 is on Tuesday night in Boston.

Antetokounmpo added seven rebounds and five assists, while Middleton scored 23 points. The Bucks’ two best players were clutch in the closing seconds of a tense victory, another sign of maturity for the one of the league’s up-and-coming teams.

“One of the most important things that we can carry from this game moving forward is that we stayed disciplined and we trusted one another,” Antetokounmpo said.

“This win is incredible. We kept our composure and fought all the way to the end.”

It could just as easily have fallen apart for Milwaukee after losing a 20-point lead with 7:37 left in the third quarter.

Jaylen Brown had 34 points for the Celtics, while Tatum added 21. Tatum’s 18-footer with 52 seconds left gave the Celtics a brief 100-99 lead.

He just couldn’t hold off Antetokounmpo on the other end for the decisive tip-in.

The disappointing end for the Celtics overshadowed their spirited rally from a 65-45 deficit. Play got chippy and the Celtics limited the Bucks’ transition game.

They came up one basket short at the end.

Antetokounmpo “made a great tip-in and he was battling for the ball. That’s what great players do,” coach Brad Stevens said.

“We played great in the second half. We played great in the first six minutes of the game. The 18 minutes that ended the first half were not good. They had a lot to do with that.”

Both teams traded clutch buckets down the stretch.

After Tatum’s long jumper, Brogdon hit a transition 3 from the corner for a 102-100 lead with 33 seconds left. Al Horford followed with two foul shots to tie the game at 102 with 29 seconds remaining.

They couldn’t send the game into overtime. Morris bent over in frustration near the Boston bench after his fadeaway hit the rim.

“We got the look we wanted ... It’s a shot that (Morris) can make 10 out of 10 times,” Brown said. “It didn’t go in tonight. So Game 5, keep moving forward.”