The Indian duo lost the first game 19-21 but recovered strongly to win the next two 21-9, 21-13 in their round of 32.
However, Birmingham Commonwealth Games bronze medalists Treesa Jolly and Gayatri Gopichand bowed out of the tournament after losing in straight games in their opening women’s doubles.
Treesa and Gayatri put up a valiant fight before losing 21-23, 20-22 to sixth-seeded Thai pair Jongkolphan Kititharakul and Rawanda Prajongjai.
In the mixed doubles, Ishaan Bhatnagar and Tanisha Crasto also failed to make it through the first round, losing 13-21, 16-21 to Japan’s Kyohei Yamashita and Naru Shinoya.
After two setbacks, the world’s No. 8, Rankireddy and Chirag, ended the day on a positive note for India.