Razzano breezed to a 6-2, 6-0, decision over Elena Vesnina. Dulko eliminated Nathalie Dechy, 7-6 (7-4), 6-4.
The finalists emerged from a field of 16 that took part in a U.S. Open tune-up at the famed West Side Tennis Club.
Razzano will be seeking her first WTA Tour title. Her only other appearance in a final came in Tashkent three years ago.
Dulko is a one-time winner on the circuit, having claimed the title in Budapest in April.
Razzano won the only previous meeting between the two, but that came four years ago.