Indiana Pacers second-year center Myles Turner scored 30 points, tied his career high with 16 rebounds, blocked four shots and made a 3-pointer in overtime that started the decisive 8-0 run in his first opening night start.
In a game that was supposed to be all about the Pacers' revamped roster and new up-tempo style, Turner stole the show by making 13 of 19 shots, coming up with big play after big play and overshadowing All-Stars Paul George and Dirk Nowitzki.
George added 25 points, including another 3 with 55 seconds left to seal Indiana's fifth season-opening win in six years.
Deron Williams led Dallas with 25 points. J.J. Barea and Nowitzki each had 22 as the Mavs lost their fifth in a row in the series.
Forward Thaddeus Young returns to his previous home when the Pacers visit Brooklyn on Friday night. Indiana won three of the four meetings with the Nets last season and is 4-3 all-time at the Barclays Center.