The eighth-seeded Mavericks bounced back from consecutive losses by handing the Spurs their first road defeat when leading after three quarters this season.
Tony Parker scored 22 to lead the heavily favored Spurs, who are stuck in a tossup series after they won all four games against Dallas during the regular season. San Antonio took a nine-game winning streak against the Texas rival into the sixth postseason meeting between the teams.
The second Game 7 between these teams is Sunday in San Antonio. The Mavericks won the other one there in 2006.