PHOENIX — Tameka Johnson had 23 points and three assists to lead Seattle past Phoenix.
Tina Thompson added 18 points and seven rebounds for the Storm (13-13), who have won all four meetings with the Mercury (14-13) this season and have won four of their past five overall.
Candice Dupree had 17 points while Diana Taurasi added 16 points and seven assists for the Mercury, who lost for just the second time in six games under interim head coach Russ Pennell.
No. 1 draft pick Brittney Griner had 12 points and five rebounds for the Mercury.