Host Stony Brook broke open a tight game with a 5-1 run to open the second half and tacked on five late goals to defeat UMBC, 16-6, at La Valle Stadium.
SBU improved to 9-3 on the season and 2-0 in league play, while UMBC slid to 4-7 overall and 1-2 in America East action.
The loss was UMBC's first-ever to Stony Brook in the ninth meeting between league rivals.
UMBC junior midfielder Lindsay Cox (High Bridge, N.J.) led the visitors with two goals and one assist and sophomore midfielder Taeler Errington (Valley Lee, Md./Leonardtown) had a pair of goals.
The Retrievers scored first, as sophomore midfielder Kristen Bilney (Ellicott City, Md./MountHebron) cashed in on a free position attempt 6:35 into the game. Stony Brook went on a 4-1 run to take a two-goal advantage, but UMBC senior midfielder Alicia Krause (Ellicott City,Md./Mount Hebron) gave the visitors hope heading into the break with a goal with 4:40 remaining in the stanza and the Retrievers trailed just, 4-3 at halftime.
But the Seawolves scored three times before five minutes had elapsed in the second half. Cox scored both of her goals in the second half and had UMBC within range after her second score cut the deficit to 11-6 with 7:23 remaining. But Stony Brook won the ensuing draw and maintained possession until Michelle Rubino tallied with 4:36 to play to cut off the any hopes of a Retriever rally.
Stony Brook outshot UMBC 26-20, and controlled 17 of 24 draws. They hit on 4-of-6 free position opportunities, while the Retrievers only converted 1-of-4.
SBU midfielder Janine Hillier led all scorers with six goals and one assist.
UMBC heads right back up to the Empire State on Friday and faces Binghamton on Saturday at noon in a critical America East match.