Tatum hits OT buzzer-beater as Celtics beat Nets 125-124 Jayson Tatum scored 40 points and hit a 17-foot jumper at the overtime buzzer to give the Boston Celtics a 125-124 win over the Brooklyn Nets on Tuesday night. Jayson Tatum buried a 17-foot jumper at the overtime buzzer to cap a 40-point night, and the Boston Celtics beat the Brooklyn Nets 125-124 on Tuesday night at TD Garden before a sellout crowd of 19,156. It was Boston's third straight victory. The Celtics have not lost since they blew a 22-point lead in their season opener at Detroit. Tatum finished with 40 points, eight assists, five rebounds and a career-high 18 made free throws on 22 attempts. He shot 10 of 20 from the field.Paul George And Derrick White Provide SupportPaul George added 20 points and Derrick White scored 16 for the Celtics. Michael Porter Jr. had 27 points and 12 rebounds for Brooklyn (0-4), and Julius Randle scored 24 points before fouling out. Nets rookie Mikel Brown Jr. made a tying 3-pointer with three-tenths of a second remaining in regulation. He scored 13 points in the fourth quarter and finished with 17.Randle scored a dozen in the fourth-quarter comeback and hit the first two buckets of overtime to give the Nets a 121-117 lead. In overtime, Brooklyn was clinging to a 124-123 edge when Brown missed a driving layup, and center Day'Ron Sharpe was initially whistled for a loose-ball foul with 6.1 seconds to play. After coach Jordi Fernandez called a timeout to challenge, the call was reversed to a foul on Luka Garza.Brown missed another layup, an inadvisable attempt with the shot clock off, and Boston rebounded with 2.3 seconds to go, setting up Tatum's winner. Neither team led by more than eight points. The Nets took a 61-56 lead into intermission, forcing 10 turnovers and holding the Celtics to 2-of-16 shooting from 3-point range in the first half. Boston fared better from long range in the second half, going 9 of 22.Brooklyn Nets Lead Before Third Quarter CollapseBrooklyn led 77-70 with 6:40 left in the third quarter after a Randle free throw, then went ice-cold and conceded an 11-2 run over the next 5 1/2 minutes, with Tatum's 3-pointer leaving the Nets in an 81-79 hole. The Nets went ahead 109-104 on a basket by Randle with 2:57 left. Boston answered with a 10-2 run, with Brooklyn's only points a strong drive by Brown to knot the score at 111-all with 44.9 seconds to play.With 33.7 seconds remaining in regulation, White slipped behind the defense and Tatum found him for a tiebreaking dunk. White was fouled on the play and converted the free throw for a 114-111 lead. Porter missed a 3-pointer, and even after Brooklyn grabbed the offensive rebound, Randle couldn't get a clean look and lost the ball. It swung to Chaney Johnson, who missed a potential tying corner 3.Mitchell Robinson Misses Free Throws To Extend GameBoston could have iced it at the line at 117-114, but Mitchell Robinson missed two free throws with 3 seconds left, giving Brooklyn a chance at the tying 3. Brown converted it to force overtime. Egor Demin was forced out of the game in the first half with a right leg contusion. After appearing to knock legs with Paul George while defending the latter's drive, Demin came up hobbling on Brooklyn's ensuing possession.The young Russian checked out with 2:22 left in the half, limped into the locker room and was ruled out for the rest of the night shortly thereafter. Brown, the sixth pick in the NBA draft out of Louisville, missed a layup with 2.3 seconds left in overtime to set up Tatum. The Nets should not have switched on the last play but did, missing Noah Clowney's size on Tatum.Tatum Size Proves Decisive In Overtime VictoryThe Celtics star was too big for Keon Ellis and that made the difference. Other than a five-minute shooting barrage in Cleveland, this was the Nets' best all-around effort of the young season, but the outcome was the same: defeat.