Also through was fourth-seeded Emi Mutaguchi of Japan.
Ankita outplayed Malaysia's Theiviya Selvarajoo 6-2 6-2 while Prarthana ousted her Indian rival Jeni Patel 6-1 6-2 in one-sided first round matches.
Fourth seed Emi Mutaguchi scored a 6-3 6-2 win over her Indian rival Arantxa Andrady.
Sixth seed Prerna trounced Aashima Garg 6-0 6-1 and seventh seed Natasha out-rallied Sharon Sanchana Paul 6-3 6-4 to move into the last sixteen in the singles.
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In a well-contested match Japanese Chihiro Nunome registered a 6-1 6-4 win over India's Sharmada Balu to enter the second round. She would take on Prarthana for a place in the last eight.
In her pre quarter finals, fourth seed Sowjanya Bavisetti will take on Emi Mutaguchi and no. 5 seed Shweta Rana would clash with wild card Rutuja Bhosale, who defeated Anushka Bhargava 6-4 6-1.
Doubles results (Round 1): Emi Mutaguchi/Nunome Chihiro (Jpn) bt Riya Bhatia/Amrita Mukherjee(Ind) 6-3 6-1; Akshara/Iska Teertha bt Aashima Garg/Shrishti Slaria 6-4 6-1; Sanya Madan/Preethi Ujjini bt Sahan Shetty/Vaibhavi Trivedi 6-4 4-6 10-3.