Sue Bird scored 22 points and Swin Cash added 20 in the Seattle Storm's 79-71 victory over the Washington Mystics on Tuesday.
Seattle (7-4) has won three of four, a stretch that started with a 73-63 victory at Washington on July 3. The Mystics (2-9) have dropped four in a row.
Camille Little had 12 points for Seattle.
Washington was led by Marissa Coleman's 16 points. Matee Ajavon had 13, and Mystics leading scorer Crystal Langhorne added 10 in her return to the lineup after she missed three games because of back pain. Langhorne, who averages 18.1 points, hadn't played since June 26.
Bird, who topped the 20-point mark for the fourth time this season, sealed the win by scoring on a fast-break lay-in with 42.3 seconds to give the Storm a 78-71 lead. She added a free throw with 16.5 seconds to go.
Washington got within 76-71, but was scoreless for the final 2:08 of the game.
Seattle built leads of 12 points five times, the last at 59-47 late in the third quarter.
The Mystics used long-range shooting to stay in the game, making 10 of 17 attempts from behind the 3-point arc. Washington cut its deficit to two at 61-59 on Nicky Anosike's two free throws with 9:37 left.