Bishop scored back-to-back baskets to put the Storm (2-2) ahead by three points, 53-50, with 4:18 left in the game -- their first lead since the opening minutes.
The rookie and No. 1 draft pick Jewell Loyd added Seattle's final six points to help them snap a two-game losing streak. She finished 4 of 10 from the field after entering the game averaging 5.0 points on five-for-31 shooting.
Jantel Lavender led the Sparks (0-2) with 12 points and nine rebounds. Erin Phillips and Alana Beard each added 10 points. The Sparks were again without Candace Parker, Kristi Toliver and Nneka Ogwumike who also missed the season-opening 86-61 loss at Seattle on June 6.