Supriya, who entered the main draw as a lucky loser and is ranked 127, downed 110-ranked Sharmeen in a match that went on for almost 2 hours with a 1-6 6-4 6-1 scoreline.
The winner meets another Maharashtra girl Pareen Shivekar next for a place in the quarters. Pareen was leading 1-0 against 5th seed Krishnali Bhonsle when the latter conceded the match.
In another first round match featuring two Maharashtra players, Tanasha Khandpur defeated Dakshata Patel 6-2 6-3 while second seed Jeni Patel from Gujarat crushed Karnataka's Nupur Umashankar 6-1 6-0 in another totally one-sided first round encounter.