BOSTON -- The Celtics dont want to rely solely on Isaiah Thomas to win.But on some nights, putting the ball in the All-Star guards hands is simply the best option.Thomas scored 22 of his 30 points in the fourth quarter in Bostons 90-83 victory over the Dallas Mavericks on Wednesday night.He scored 20 of Bostons final 24 points to help the Celtics beat back a late Mavericks surge.Avery Bradley added 18 points and 13 rebounds.After the Mavericks took a 70-66 lead, Thomas scored Bostons next 13 points to put the Celtics back in front 79-76. They never trailed again.After one of the baskets late in the run Thomas ran down the court and flashed two thumbs up.I guess I just like that quarter, Thomas said. Sometimes guys get a little tighter, and then the pressure gets a little tougher for them. I guess I like the pressure.Harrison Barnes led the Mavericks with 28 points. Wesley Matthews added 22.Dallas, which was already missing several players because of injuries, lost two more. Starter Deron Williams exited in the second quarter with a left calf injury, and J.J. Barea was helped off the court in the fourth quarter after straining his left calf as well.Coach Rick Carlisle said it appears Barea will be out for a while, but added that he didnt think it was real serious. He said its his understanding that Williams just experienced some tightness.The Celtics outrebounded Dallas 53-32, which coach Brad Stevens said is a welcomed sign for a team that struggled in that department early in the season.Maybe its the law of averages, and some just bounced our way, Stevens said. But were defending at a better rate than we were.TIP-INSMavericks: Have lost three straight. ... Had a season-low 31 points at the first half. ... Dirk Nowitzki missed his fifth straight game with a right Achilles strain.Celtics: Thomas has scored 20 or more points in each of the first 11 games of the season. ... Scored a season-low 90 points. ...Tied their season high with 19 turnovers. ... Bostons 10-point second quarter was its lowest scoring output in a second quarter this season. ... Al Horford remains in the NBA concussion protocol and sat out his eighth straight game. Jae Crowder missed his seventh consecutive game with a sprained left ankle.TEAM MEETINGCeltics guard Marcus Smart said the team held a meeting after its blowout loss to the Wizards on Nov. 9 to help refocus its commitment on the defensive end.It was no coaches, just us, Smart said. We had to look ourselves in the mirror and come to the conclusion that it is on us and were the ones playing and that we have to get it together.Bradley said the conversation was frank and honest.Just that we need to hold each other accountable, he said. We werent playing to our ability. We had two or three guys playing hard at the defensive end, but the other three guys werent. And we needed everyone playing hard consistently as a team. Tonight I feel like was one our best defensive games.NO FREEBIESThere werent many trips to the free throw line in the first half for either team. The Celtics were just 2 for 6 in the half, and the Mavericks missed their lone attempt in the first quarter. Neither team attempted a free throw in the second quarter.INJURY UPDATEStevens said Crowder would practice Friday, but that he does not expect him to play Saturday against Golden State. Stevens said his last report on Horford was that the big man had a great workout on Wednesday.Carlisle said Dirk Nowitzki is making progress as well.It feel likes hes getting close, he said.UP NEXTMavericks: Return home Friday to host the Grizzlies, before heading back on the road for trips to Orlando and San Antonio.Celtics: Host the Warriors Friday, and then begin a three-game trip with a stop in Detroit on Saturday.---Follow Kyle Hightower on Twitter at http://www.twitter.com/khightower Jerry Rice Jersey . 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The lead reached 21 points wiith 6:44 remaining on Bakers 3-pointer.ddddddddddddody John had two 3s and 12 points for Weber State (2-2), which closed the first half on a 30-12 spurt to take a 39-32 lead.Joe Mooney led UC Davis (4-2) with 12 points on 4-of-4 shooting and Siler Schneider added 11.It was the Aggies inaugural game in the longest running regular-season tournament. ' ' '