Sue Bird capped the first-half scoring with a 3-pointer to extend Seattle's lead to 46-33. The Storm outscored Phoenix 31-13 in the second quarter after the Mercury opened the game on a 13-2 run.
The Storm went on a 10-2 run - eight coming from the line - for an 11-point lead with 6:11 remaining in the fourth quarter. Their lead didn't drop below nine points the rest of the way.
Alysha Clark added 16 points for Seattle (1-1) and Bird finished with 11. Loyd made all 10 of her free throws as Seattle hit 22 of 23 compared to Phoenix's 11 attempts.