Celtics hold off Mavericks rally to move within one win of NBA title
Tatum broke out of his scoring doldrums to score 31 points. Brown scored 15 of his 30 in a scorching third quarter and the Celtics held on to move within one victory of a record-setting 18th NBA crown.
Boston, who currently share the record of 17 titles with the Los Angeles Lakers, can close out the series in game four in Dallas on Friday.
"We are not relaxing or anything like that," Tatum said, "not even focusing on winning on Friday or whatever.
"However long it takes, that's our motto. However long it takes, that's what it's going to take, and nobody is not trying to relax at all."
However, the Mavericks go into Friday knowing full well that no team has rallied from 3-0 down to win an NBA play-off series.
With their backs against the wall, the Mavericks sliced a 21-point fourth-quarter deficit to one on Kyrie Irving's jump shot with 3:37 remaining.
By that point, Mavs star Luka Doncic could only watch in frustration. He fouled out with 4:12 remaining, earning his fifth and sixth fouls in less than a minute.
Mavericks coach Jason Kidd challenged both and lost, Doncic departing with the Mavs down by three after he was whistled for a blocking foul on Jrue Holiday.
Dallas kept pressing, but the Celtics had the answers. Irving found Dereck Lively for a cutting dunk that pulled the Mavs within 100-98 with 1:20 remaining.
But Brown drilled a jump shot and after Irving missed a tough three-pointer Derrick White and Tatum each made a pair of free throws and the Celtics notched their 10th straight play-off victory, remaining unbeaten on the road this post-season.
"That was a big-time win for us, and I'm proud of how we played today," Brown said. "They had some momentum, but we kept our poise. We made timely baskets.
"We got some good shots going in, and we found a way to win."
Irving shook off sub-par shooting performances in the first two games to lead the Mavericks with 35 points. Doncic finished with 27 points six rebounds and six assists before fouling out for just the third time in his career.
Doncic was clearly frustrated with the officiating.
"We couldn't play physical," he said. "I don't want to say nothing ... you know, six fouls in the NBA Finals - c'mon man. (Do) better than that."
Even though 156 teams before them have tried and failed to rally from 3-0 down to win an NBA play-off series, Doncic wasn't ready to wave the white flag.
"It's not over til it's over," he insisted. "We've got to stay together."
Porzingis sidelined
After a sombre pre-game tribute to NBA icon Jerry West, who died Wednesday at the age of 86, Dallas pounced on the opportunity opened up by the absence of Boston big man Kristaps Porzingis, dominating in the paint in the first quarter.
With Doncic and Irving leading the way Dallas led by as many as 13 points - Irving's first three-pointer of the series putting Dallas up 25-12.
"They came out swinging," Tatum said. "That was to be expected. They were at home, and their crowd was behind them. This is obviously a big game. So we expected their first punch."
But the Celtics responded and took their first lead of the game minutes into the second quarter.
The lead would change hands six times in the period before the Mavericks emerged with a 51-50 half-time lead.
The Celtics exploded after the break, making their first seven shots of the third quarter.
White's big block led to a dunk from Brown that gave Boston a 71-61 lead midway through the period.
White banked in a three-pointer and Brown drove for a dunk to push the Celtics' lead to 85-70 going into the fourth, the advantage swelling to 91-70 before Dallas mounted their late charge.
"Unfortunately, we could just not get over the hump tonight," Kidd said.