Winless in three tries against Boston this season, the Flash scored a pair of early goals against the Breakers.
Samantha Kerr got the first in the 23rd minute. Abby Wambach with the headball and Kerr did the rest.
In the 27th minute off the free-kick, Wambach with the re-direct header for the goal.
Flash hold on for the 2-1 win to clinch home field for next week's semifinal playoff game.