Abby Bishop scored 17 points, but the Storm fell behind by 20 in the first quarter and could not recover in an 87-74 loss to the Mystics on Wednesday in Washington, D.C.
The Storm (5-14) allowed the Mystics to score 34 first-quarter points and 53 first-half points, both season highs. Seattle has lost seven consecutive road games.
Ivory Latta made four three-pointers and scored 20 points to lead the Mystics to their fourth consecutive victory.
Tayler Hill added 18 points for Washington (10-6) and All-Star Stefanie Dolson added 17 points and nine rebounds. The Mystics scored 34 first-quarter points and 53 first-half points, both season highs.