Also winning matches Saturday were Adrienne Markison (Princeton, N.J.), Sarah Viebrock (Carmel, N.Y.), and the doubles tandem of Lavinia Cristescu (West Hartford, Conn.) and Lisanne Steinert (Glauchau, Germany).
Labarthe beat Marist's Maria Yurgel, 6-2, 6-1, in the quarterfinals before breezing by Pittsburgh's Jocelyn Lu by the same score in the semifinals.
Markison fell in the A Singles quarterfinals to Hofstra's Elena Ivanova, 6-2, 6-1, before bouncing back to defeat Army's Emily Stein, 8-1, in the Duty Singles Alpha quarterfinals.
Viebrock defeated Rhode Island's Kirsten Leikem, 8-2, in the D Singles consolation quarterfinals, before falling to UConn's Abby McKeon, 8-5, in the semifinals.
Cristescu and Steinert advanced to the B Doubles semifinals with an 8-6 victory over Fairleigh Dickinson's Irina Dementyeva and Dzana Ferhatbegaovic, before falling to Stony Brook's Fanny Charliquart and Gayatri Krishnan, 8-3.
West Point Eastern Tennis Invitational action resumes tomorrow morning at 9.