Rishika, ranked 551 in the world, outplayed countrywoman Vaniya Dangwal 6-1, 6-4 while Shweta, ranked 558, was stretched by wild card Teertha Iska before eking out a 4-6 6-1 6-0 victory in 2 hours and 10 minutes.
Nidhi also faced a rough time before overcoming a fighting Eetee Maheta 5-7 6-2 6-0 to make it to the last sixteen.
Scratch pair of Rutuja Bhosale and Natasha Palha registered the first upset of the event as they saved 3 match points to push out fourth seeds Nidhi and Prerna Bhambri 1-6 6-3 [13-11] to enter the quarterfinals of the doubles event.
Doubles (1st round): Shweta Rana/Rishika Sunkara [3] bt Arantxa Andrady/Sharon Sanchana Paul 6-2 6-1; Rutuja Bhosale/ Natasha Palha bt [4] Nidhi Chhlumula/Prerna Bhambri 1-6 6-3 [13-11]; Eetee Maheta/Anushka Bhargava bt Vaniya Dangwal/Theiviya Selvarajoo (Mas) 6-4 6-2; Ankita Raina/ Prarthana Thombare bt Amreen Naaz/Swetha Nalikala 6-0 6-0.
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