Alana Beard scored five of her 11 points in overtime including a 3-pointer that put Los Angeles ahead for good in a 77-75 victory to end Seattle's five-game win streak Tuesday.
Candace Parker led the Sparks (13-8) with 21 points. She added 10 assists and was a rebound shy of a triple-double with nine boards.
Beard's shot from behind the arc came with 3:23 left in overtime and put Los Angeles ahead 71-70. After Breanna Stewart missed a pair of shots, Beard came back with a jumper to extend the Sparks' lead.
The Storm (15-6), who lead the WNBA's Western Conference, could not respond.