Dallas (12-8) had its lead cut to 71-70 after the Sparks' Riquna Williams hit a 3-pointer with 7:52 to go. The Wings then went on a 21-2 run before the Sparks (13-9) scored the final five points of the game.
Dallas took the season series with the win. The Wings won 101-72 in Dallas on June 22, and the Sparks won 87-83 in Los Angeles four days later.
Los Angeles has lost six of its last eight.