Competing in junior boys Group 2, 15th seed Pandey suffered a tame 4-11 9-11 5-11 3-11 defeat against eighth seed Helshan Weerasinghe of England.
Mudit Dani met a similar fate in Group 1 as he lost 3-11 5-11 9-11 4-11 to seventh seed American Zhang Kai.
In the girls event, Archana Girish Kamat lost 2-4 (11-3 1-11, 8-11, 3-11, 7-11, 5-11) to Romanian rival Andreea Dragoman.
The Romanian was a tricky player and she seized the opportunity quickly to go up.
Meanwhile, 12th seed Korean Seri Park surprised third seed Zhu Chengzhu of Hong Kong with a 4-2 win in group 3 while in another match in the same group, 14th seed Angela Guan shocked sixth-seeded Brazilian Bruna Takahashi by a similar margin of triumph.