Top-seed Sumit Nagal lost the first set against Jui-Chen Hung of Taipei 3-6 and was on the verge of an exit, trailing 2-5 before bad light halted play.
Hung played consistent tennis while Nagal's shoulder injury seemed to be playing up again.
However, third-seed Karunuday Singh bowed out, losing 2-6, 6-7 to Korea's Tae-Woo Lee in the opening round.
The No.6 seed Haadin Bava got the better of National Junior Champion, Dhakshineswar Suresh, 6-4, 7-6.
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Other results (Indians unless otherwise specified) - Singles 1st round: Lucas Gomez (MEX) [5] bt Tejas Chaukulkar (IND) 6-4, 6-2; Vinayak Sharma Kaza bt Yu Hsiang Chiu (TPE) 6-3, 7-6(6); Colin Van Beem (NED) [4] bt Li-Wie Tan (TPE) 6-2, 6-4.
Jayesh Pungliya bt Cing-Yang Meng (TPE) 6-3, 3-6, 6-4; Kelsey Stevenson (CAN) beat Paramveer Singh Bajwa 6-4, 6-2.
Yesterday's matches: Seong-Gook Oh (KOR) bt S D Prajwal Dev 6-2, 4-6, 6-1; Clement Larriere (FRA) bt Vasisht Cheruku 6-0, 6-4; Cameron Silverman (USA) [8] bt Rishabdev Raman 6-0, 6-1; Ranjeet Virali-Murugesan (IND) bt Mohit Mayur Jayaprakash 6-2, 6-2.