Mavericks Celtics Basketball

Boston Celtics center Kristaps Porzingis tries to block a shot by Dallas Mavericks center Daniel Gafford during Thursday’s game at TD Garden. Charles Krupa/Associated Press

BOSTON — Klay Thompson scored 25 points, Daniel Gafford gave the Mavericks 15 rebounds in what could be his last start at center for a while, and Dallas beat the Boston Celtics 127-120 on Thursday night in their NBA Finals rematch.

With recently acquired big man Anthony Davis out because of an abdominal strain and cheering on his new teammates from the bench, the Mavericks led by 27 points in the second half. Spencer Dinwiddie added 22 points off the bench.

Celtics coach Joe Mazzulla put in his reserves early in the fourth quarter, and they unexpectedly went on a run that closed the deficit to single digits in the final minutes.

Jaylen Brown, who won the NBA Finals MVP in June while leading Boston to a five-game victory over Dallas, scored 25 points, and Jayson Tatum had 17. Payton Pritchard scored 21, leading the late rally.

Takeaways

Dallas: Davis’ anticipated debut with the Mavericks after he was acquired on Sunday for five-time All-NBA first-teamer Luka Doncic will have to wait until at least Saturday.

Boston: The finals rivals played both of their regular-season matchups this year in the last two weeks and split them.

Key moment

Irving had a slow start, with just four points in the first half. But with just under 10 minutes left, he pulled up for a 3-pointer from the top of the key to give the Mavericks a 114-90 lead – their biggest of the game. After a timeout, Irving hit another 3 – this one a second-chance basket from the left side.

Key stat

Thompson scored 23 in the first half.

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