The Wings (22-18) had an eight-point lead after three quarter and outscored the Dream 28-19 in the final period to put the game away.
Rhyne Howard led the Dream with 19 points, seven assists and four rebounds. Cheyenne Parker and Allisha Gray each had 13 points.
Howard finishes the regular season as the Dream’s high scorer with 681 total points. She had career-high numbers for the season in points, rebounds, assists and 3-pointers made.
Parker joined Howard and Gray in the 600-point club, becoming the third trio in WNBA history to have three different players to score 600-plus points in a season.
Arike Ogunbowale led the Wings with a game-high 32 points.
Dream playoff schedule
Game 1: Friday, Atlanta at Dallas, 9:30 p.m., ESPN2
Game 2: Tuesday, Sept. 19, Atlanta at Dallas, 9 p.m. ESPN
Game 3*: Friday, Sept. 22, Dallas at Atlanta, TBD, ESPN2