Maker, the 21-year-old big man, had eight points and five blocks in Sunday's win, proving to be a game-changer on both ends with his length and spacing ability.
Marcus Morris had a shot to tie the game up at the buzzer but missed a 14-footer.
Popovich missed his second straight game after his wife, Erin, passed away Wednesday following a prolonged illness.
Kevin Durant had 34 points and 13 rebounds for the Warriors, who can wrap up the series in Game 5 at home Tuesday. The rabid Bradley Center crowd, hungry for the Bucks' first victory in a playoff series since 2001, provided the energy boost the team needed.
Giannis Antetokounmpo enhanced his reputation as one of the best players in the NBA with the game-winning play for the Milwaukee Bucks as they levelled their first-round NBA Eastern Conference playoff series against the Boston Celtics at 2-2. They erased the deficit over the next quarter-and-a-half and seized a 100-99 lead on Jayson Tatum's jumper with 52.4 seconds remaining.
But when Bledoe's drive missed, Antetokounmpo got his long arm in the mix for a tip and a 104-102 Bucks lead with 5.1 seconds left. "We were better on Middleton, I thought we did a decent job on Giannis, and we played more the way we want to play in the second half". Because Maker isn't a traditional center and capable of both putting the ball on the deck and hitting threes (he was 2-5 from three-point range in Game 3), he provides a unique presence from a defensive perspective.
"It's a heck of play", coach Joe Prunty said.
The Celtics were abysmal over the first two quarters while afflicted with a familiar malady - the inability to make a shot.
Brogdon restored the Bucks' advantage with his corner three with 33.5 seconds remaining. Play got chippy and the Celtics limited the Bucks' transition game.
The Celtics finished the day shooting 41.4 percent from the field, while going 10-for-29 from deep (34.5 percent). Later, Parker complained about his lack of playing time and Eric Bledsoe refused to acknowledge that Boston point guard Terry Rozier, playing in place of injured Kyrie Irving, had schooled him in the first two games. Jabari Parker continues to play well, recording 16 points, seven rebounds, and three blocks.
"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. Those two players made a significant impact on Games 3 and 4, to say the least. "Without those guys, we're not going to win these games".