World No 9 Sindhu fought hard for 54 minutes to beat World No 23 Michelle Li of Canada in three hard-fought games. The final score was 19-21, 21-16, 21-11 in favour of the lanky Indian girl. She will face world No 3 Wang Shixian of China in the last eight clash.
Meanwhile, London Olympics bronze medallist Saina opened her campaign with a straight game win over qualifier Chisato Hoshi of Japan. The sixth seeded Indian beat her Japanese opponent 21-12 21-12 in 34 minutes to progress to the second round.
World number 36 Anand Pawar squandered a first game advantage to suffer a 21-14 12-21 12-21 defeat against Chinese Taipei's Tien Chen Chou in a 51-minute men's singles match. This was Anand's third defeat to Chou. He had lost to the Taiwanese shuttler in German Open this year.
Pawar had fended off the challenge from another German Tobias Wadenka 21-11 21-4 in the second round.
Top Indian male shuttler Parupalli Kashyap eased into the third round. The third seed Indian took 33 minutes to dispose off Lukas Schmidt of Germany 21-15 21-14 last night to secure his place in the pre-quarterfinals of the men's singles event.