Former Gonzaga player and Kentwood High School star, Courtney Vandersloot, ran her team with efficiency helping Fowles and Prince finish with 24 and 23 points, respectively.
Fowles, the WNBA scoring leader, had 24 points and nine rebounds, and Prince added 23 points for Chicago (8-8), which won its second in three games. Both players were announced as All-Star reserves at halftime.
Sue Bird scored 26 points for the Storm (7-7), who dropped their third straight.
Trailing 71-69 with 1:56 remaining, Swin Cash and Tanisha Wright of the Storm each had the ball stolen from them during the Sky's 9-0 closing run. The Storm gave up 30 points on 17 turnovers.
Ashley Robinson had 14 points and Cash added 10 for Seattle.
Vandersloot, finished with 11 points, seven assists and five rebounds.