Zvonareva defeated Catalina Castano 6-2, 6-4 to maintain a perfect 3-0 record against the Colombian, and Ukraine's Vakulenko dispatched Paraguay's Rossana de los Rios 6-2, 6-0 in their first meeting in five years.
Local hope Aleksandra Wozniak defeated American Ashley Harkleroad 6-4, 6-2 one round earlier than she did at last year's tournament where she reached the quarter-finals for the first time, and fifth-seeded Olga Govortsova of Belarus celebrated her first time in the top 50 by beating Jorgelina Cravero of Argentina 6-4, 6-3.
In the last regular WTA Tour event of the year before the season-ending, eight-women tour championship, Zvonareva had a final chance to win a singles title for a fourth straight year.
She missed four months in the middle of the year after injuring her left wrist in the semi-finals at Charleston in April. The Russian returned for the US Open and enjoyed a solid European indoor season with a semi-final and two quarter-finals.
Top-seeded Nicole Vaidisova had a similar year with a bright start ruined by a virus which forced her to miss much of the US summer hardcourt swing. She rebounded, however, with semi-finals at her last two tournaments in Zurich and Linz. Her first match in Quebec City will be against fellow Czech Renata Voracova.
Also entered, with a wild card, was Lindsay Davenport, playing her third event in her comeback since the birth of her first child. Off the tour for a year until last month, she won her first tournament back in Bali.
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