After losing the first set, Koryttseva managed to stretch the match to the third set, as the 65th-ranked Nakamura made several errors.
Seventh-seeded Russian Elena Vesnina also bowed out on the opening day. Australia’s Nicole Pratt spiked Vesnina 6-3, 6-4.
A late surge saw Vesnina make a service break to draw 4-4 level in the second set, but Pratt tightened her game to emerge the winner.
The battle between sisters Alona and Kateryna Bondarenko of Ukraine was a see-saw affair, finally clinched by Alona 7-5, 6-4.
Camille Pin of France advanced to the second round by defeating Indonesia’s Angelique Widjaja 6-4, 6-0, while Hungary’s Melinda Czink outplayed India’s wild card entry Rushmi Chakravarthi 6-1, 6-2.
Results:
Alona Bondarenko (UKR) bt Kateryna Bondarenko (UKR) 6-4, 7-5; Mariya Koryttseva (UKR) bt Aiko Nakamura (JPN) 0-6, 6-3, 6-3; Melinda Czink (HUN) bt Rushmi Chakravarthi (IND) 6-1, 6-2;Camille Pin (FRA) bt Angelique Widjaja (INA) 6-4, 6-0; Nicole Pratt (AUS) bt Elena Vesnina (RUS) 6-3, 6-4.—Agencies