St. Mary's (5-6-1, 3-1-1 CAC) jumped ahead first at 18:07 as senior forward Erika Kenny deflected in a loose rebound on the goal line following sophomore Tina Brehm (Springfield, Va., Robert E. Lee)'s initial save of senior midfielder Sophia Esparza's shot.
The Seahawks continued to fire in the first half, outshooting Mary Washington 11 to1, but were unable to capitalize and carried a 1-0 lead into halftime.
Mary Washington (8-2-3, 3-1-2 CAC) evened the match at 1-1 at 60:58 on sophomore midfielder Becky Clark (Doylestown, Pa., Central Bucks West)'s first goal of the season. Clark collected a cross from freshman forward Sunny Herold (Palmyra, Va., Fluvanna) at the left side of the box and sailed in a shot into the top right corner.
Both teams each had a shot in the first 10-minute overtime period as St. Mary's freshman midfielder Liza Sitz's shot went wide and freshman goalkeeper Grace Koplow had a diving save to deny the Eagles' junior forward Chrissy Reardon's shot with eight seconds left.
In the second and final 10-minute overtime period, each team took three shots. The league's leading scorer, UMW's sophomore forward Amy Olson rattled off two shots but both were rejected by Koplow, including a diving save which tipped Olson's second shot past the post.
The Seahawks tallied 23 shots to Mary Washington's 13, while corner kicks were even at seven apiece.
Koplow finished the match with six stops, while Brehm made 12 saves.
Mary Washington will next face No. 21 The College of New Jersey in Ewing this Sunday at 2:00.