The fifth seeded Indian prevailed 21-14 21-18 over Jindapol to take her head-to-head record to 7-0 against the Thai player. The World No 8 will take on third seeded Chinese Shixian Wang next.
Saina has a 6-7 head-to-head record against Shixian, having lost to her in the last two encounters.
Other Indian in fray, PV Sindhu, however, suffered a narrow 21-13 20-22 8-21 loss against the deceptive Tai Tzu Ying of Chinese Taipei in a match that lasted for an hour.
Saina, on the other hand, hardly broke any sweat as she went about her business with utmost ease. She opened up early leads in both the games and held her fort.