Sandhu beat Nandrajog 9-11, 11-7, 5-11, 11-9, and 11-4 to book a place in the last eight stage on the opening day at the Jaipur Club courts here.
16-year-old Indian Velavan Senthilkumar posted a facile victory against seventh seeded France's Arthur Moineau 3-0. Velavan had little difficulty in cruising to a 11-7,11-9,11-6 victory over his French opponent.
Top seed Mahesh Mangaonkar along with other seeded players advanced to the last eight stage.
Sixth seed, Adam Murrills of England beat qualifier Pakistan's Muhammed Asim Khan 3-2 (12-10, 10-12, 11-3, 9-11, 11-5) in a marathon match, lasting 65 minutes.
In the women's section, Sadia Gul of Pakistan beat local girl Ritika Malhotra 11-4, 11-1, 11-4, Urvashi Joshi beat Janet Vidhi 11-4, 11-8, 11-5 while Sunayna Kuruvilla defeated Nikita Joshi 3-0 (12-10,11-9,11-9) to book quarter final berths.