WASHINGTON (AP) -- Elena Delle Donne scored 22 points and the Chicago Sky beat Washington 93-79 on Sunday to prevent the Mystics from clinching a playoff spot.
Epiphanny Prince added 21 points for the Sky (22-9), who have already clinched the Eastern Conference's top playoff spot and finished the five-game season series with four victories over the Mystics.
Swin Cash had 16 points and Sylvia Fowles had 13 points and nine rebounds as Chicago won its seventh game in its last eight.
Ivory Latta scored 18 points on six 3-pointers for Washington, which closed within two points in the third quarter but never led after the first. The Mystics have lost two straight.
Crystal Langhorne added 16 points for the Mystics, who can still clinch their first playoff berth in three seasons with a win or a loss by New York. Washington visits Indiana on Tuesday night, while New York hosts Phoenix.
Down 63-58 at the end of the third, Washington closed within three on Kia Vaughn's inside basket to open the fourth.
But Chicago responded with a 12-2 game-sealing run sparked in part by Prince's drawn charge on Tierra Ruffin's layup attempt.
Delle Donne hit two fading jumpers in the spurt and a free throw after a technical foul was assessed to Latta. Delle Donne's latter jumper, off the dribble from the baseline, made it 75-62 to cap the run.
Chicago kept building its lead. Murphy's 3-pointer made it 78-64, Tamera Young's free throws stretched it to 82-66 and Prince's 3-pointer made it 85-68.
Latta and Tayler Hill's 3-pointers helped the Mystics to an 8-0 spurt close it to 85-76. But the Sky got offensive rebounds on their next two possessions and led 90-76 after Delle Donne's second 3-pointer of the game with 1:05 to play.
Delle Donne left inside the final minute to a loud ovation from a crowd that included a large contingent of supporters from the University of Delaware, the rookie's alma mater.
Monique Currie scored 13 points and Vaughn added 11 for Washington, 8-8 at home with one game left to play.