Vishnu overcame diminutive Sanam 6-7(3) 6-4 6-3 in the opening round.
Vishnu and Sanam will play the doubles main draw as wild card entrants.
Vishnu will now fight it out with Ruben Bemelmans of Belgium in the second round. Bemelmans ousted India's Ajai Selvaraj 6-1 6-0.
Also advancing to the second round was Prakash Amritraj, who got past Japanese Yuichi Sugita 6-4 3-6 6-3 in his first round qualifying match.
Amritraj next faces Theodoros Angelinos of Greece.
Qualifying Results 1st round:
V Vardhan (IND) d S Singh (IND) 67(3) 64 63
P Amritraj (IND) d Y Sugita (JPN) 64 36 63
R Bemelmans (BEL) d [WC] A Selvaraj (IND) 61 60
S Rawat (IND) d [WC] V Peranamallur (IND) 63 63
S Myneni (IND) d M Jayaprakash (IND) 63 64
N Balaji (IND) d [WC] E Antony (IND) 63 64.
