The current world No. 6 Dementieva lost to Anastasia Myskina in June's historic all-Russian Roland Garros final.
The seventh-seeded Bovina blew past American wild card Mashona Washington 6-3, 6-2, in Thursday's quarterfinals.
Another American wild card, Lisa Raymond, got past Slovakian Daniela Hantuchova 6-4, 6-3 at the Connecticut Tennis Center at Yale. The veteran Raymond awaits the Jennifer Capriati-Nathalie Dechy winner.
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