Elena Delle Donne had 18 points and eight rebounds, Natasha Cloud added 16 points and the Washington Mystics beat Chicago 80-59 on Thursday night for the Sky's fifth straight loss.
Washington (8-4) beat Chicago for the second time in four days, winning 77-69 on Sunday. The Mystics also beat the Sky 71-69 on May 26.
Ariel Atkins added 12 points and Shakira Austin had 10 points and seven rebounds for Washington. Cloud became the fourth player in team history to make 200 career 3-pointers.
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Alanna Smith had 13 points for Chicago (5-8). Kahleah Copper was 2 of 13 from the field and Marina Mabrey went 2 of 11 as the Sky shot 30%.
Washington outscored Chicago 25-9 in the first quarter after making 11 of 22 shots. The Sky made just 3 of 17 field goals in the first 10 minutes and didn't reach double figures until Dana Evans' jumper with 7:57 left before halftime.
Washington led by 19 points in the first half and cruised after halftime.