Dementieva easily defeated eighth-seeded Sorana Cirstea of Romania 6-2, 6-2 in the semifinals on Saturday.
The Olympic champion is chasing her third title of the year.
Wozniacki secured her place in the final by defeating sixth-seeded Li Na of China 7-6 (1), 3-6, 6-2.
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Dementieva, Wozniacki, Li, Cirstea reach Fortis semis
Dementieva, Wozniacki, Li, Cirstea reach quarters
