However, India's campaign was over in both the men's singles and men's doubles events.
As expected, world No. 8 Saina had an easy outing against compatriot P C Thulasi, who she beat 21-18 21-15 in a 42-minute battle, while eighth seeded Sindhu took just 31 minutes to overcome Thailand's Nichaon Jindapon 21-13 21-7.
The opening game saw some fine exchange of shots between the two Indians with Thulasi giving a good fight to her more experienced and celebrated compatriot.
In the second game, Thulasi completely ran out of steam even as a dominating Saina, seeded sixth, kept on widening the gap to eventually close the door on her lesser known opponent.
Saina will clash with Eriko Hirose of Japan in the last eight stage of the competition.
For Sindhu, it was a cake walk today as she bagged a total of 42 points as compared to just 20 won by her rival.
In the second game, however, the Thai shuttler posed some competition to the Indian but the fight lasted only till the seventh point. At 7-7, Sindhu broke off, reeling 14 straight points to seal it 21-7.
She will next take on Carolina Marin of Spain.
Meanwhile, world no. 77 B Sai Praneeth fought hard before going down 15-21 21-8 19-21 to sixth seed Chinese Zhengming Wang in a match that lasted an hour.
While Alwin Francis and Arun Vishnu lost 18-21 9-21 to third seeded combo from Taipei, Lee Sheng Mua and Tsai Chia Hsin in round two, Pranaav Jerry Chopra and Akshay Dewalkar went down 13-21 19-21 to Korea's Sung Hyun Ko and Baek Choel Shin to bow out of the tournament.
