Whalen became the 10th player in the WNBA history to each 900 career assists.
Lauren Jackson finished with 12 points before fouling out late in the fourth period. Jackson, who shot 3-for-16 from the field, is one point shy of 5,000 in her career.
Amber Holt scored five straight points in the third quarter for the Sun in a 19-8 run that gave Connecticut a 55-44 lead heading to the fourth quarter.
Seattle, which shot 30 percent from the field, never got closer than 10 in the fourth.
Tanisha Wright had 13 points for Seattle and Camille Little and Tanisha Wright had 12 apiece.
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