Dirk Nowitzki  scored 20 points and Vince Carter  added 14 off the bench to help the Mavericks pull away for a 102-91 win Sunday night at TD Garden. The loss snapped Boston’s three-game win streak, which was one shy of the four straight at the beginning of the season.
That win streak in November put the Celtics at 4-4. Sunday’s loss dropped Boston to 18-34.
The Celtics were led by Jeff Green  with 18 points while Rajon Rondo  returned from a night off Friday and scored 15 with 12 assists. Green was rumored to be trade talks between Atlanta and Celtics vice president of basketball operations Danny Ainge while Rondo’s name was again in trade rumors involving the Knicks.
The Celtics could not overcome dreadful shooting Sunday night. They were down just six at the half, 44-38, despite shooting just 27.1 percent (13-of-48) from the floor.
The Mavericks pulled away in the third quarter, outscoring Boston 28-18 to take a 72-56 lead into the fourth. Avery Bradley  (2-for-13), Jared Sullinger (4-for-13) and Green (6-for-15) highlighted the struggles of the Celtics. Sullinger extended his string of double-doubles to five games with 12 rebounds and 11 points, scoring a basket late in the fourth quarter to keep the streak alive.
Chris Johnson , signed to a multi-year deal on Friday, had a career high 14 off the bench for the Celtics.
Nowitizki had been averaging 28 points a game in his last six games entering Sunday’s contest but Dallas didn’t need him to be spectacular against a Celtics team that couldn’t find its offensive rhythm all night. Nowitzki was 7-for-16 from the field and his his three with 9:23 left in the fourth quarter put Dallas up, 81-58.
Dallas would build the lead to 24 in the fourth before a late Celtics run, sparked by the bench, cut the Mavs’ advantage down to nine, 98-89, with just over a minute left.
The Mavericks, who entered Sunday in the eighth and final playoff spot in the West, are making a push in the highly competitive conference. Sunday’s win on the parquet was their fourth straight and six in their last seven as they improved to 31-21.
The Celtics return to action Monday night in Milwaukee against a Bucks team that is currently leading the NBA Lottery race with a league-worst 9-41 record.