Even without Diana Taurasi in the lineup for the Mercury, they still had enough to beat the Mystics.
Penny Taylor scored 31 points to single-handedly dominate Washington, who fell to 9-9 on the season.
Alana Beard led the Mystics in scoring with 16.
Luckily, the New York Liberty also lost, so the Mystics are still tied for third in the East.
The Mystics get another chance against a Western opponent tonight, as they play the Sacramento Monarchs at 10:00.