Once Brothers is a 2010 sports documentary film written and directed by Michael Tolajian. It was co-produced by ESPN and NBA Entertainment for ESPN’s 30 for 30 series.

The film chronicles the relationship of two basketball players from SFR Yugoslavia—Vlade Divac and Dražen Petrović. The duo played together on the Yugoslavia national basketball team from 1986 to 1990 and were at one time close friends, but the Yugoslav Wars drove them apart emotionally, as they came from opposing sides. Petrović died in an automobile accident in 1993 before the two could reconcile; much of film focuses on Divac’s regret that they were never able to resolve their differences.

Participants in the film include: Toni Kukoč, Dino Rađa, Žarko Paspalj, Clyde Drexler, Danny Ainge, Rick Adelman, Kenny Anderson, Derrick Coleman, Bill Fitch, Larry Bird, Jan Hubbard, Magic Johnson, Jerry West, Aleksandar Petrović, Biserka Petrović, etc.

The film’s first ever public showing took place on 10 October 2010 at the Hamptons International Film Festival. Two days later on 12 October it had its television premiere on ESPN.