Allie Quigley scored 18 points, Emma Meesseman had 16 points, 10 rebounds and six assists and the Chicago Sky beat the Seattle Storm 78-74 on Wednesday for its fifth straight win.
The Sky (20-6) clinched a playoff spot with their 20th win of the season.
Meesseman made a reverse layup to give Sky a 76-72 lead and Kahleah Copper grabbed an offensive rebound on her next possession before converting 1 of 2 free throws for a five-point lead. After a timeout, Breanna Stewart made a layup with 10.7 seconds remaining to bring Seattle within three points, but Copper went 1-for-2 from the free throw line at the other end.
Copper finished with 11 points and eight rebounds for Chicago. Candace Parker had 10 points and eight rebounds. The Sky was missing guard Courtney Vandersloot due to concussion protocol.
Stewart led Seattle (17-9) with 24 points. Jewell Loyd added 18 points, Tina Charles had 11 points and six rebounds and Sue Bird scored nine points.