The World-rated Guyanese will face second-seed Madeline Perry of Ireland in the quarter-finals of the competition, which continues tomorrow.
Fernandes needed just under half-hour to topple hometown girl Dagmar Vermuelen 13-11, 11-7, 12-10 in the first round of the competition on Tuesday.
To qualify for her place in the main draw, Fernandes overcame Leonie Holt of England 11-3, 11-9, 11-4 in 20 minutes.
The 27-year-old Fernandes is currently ranked at 49th in the World, following a season in which she has reached the semi-finals of five competitions, without carrying-on to the Final.
She lost to American Olivia Blatchford in the semi-finals of the Liberty Bell Open in straight set, and suffered a similar result in the semi-finals of the Swedish Open the following month to World No.8 Vanessa Atkinson.
In April, Fernandes lost in the Final Four of the Racquet Club International to American Amanda Sohby, the same opponent that stopped her at the same stage in the New England Open the following month.
Fernandes then lost in the semi-finals of Sun & Surf Open in the Cayman Islands to another American Latasha Khan.
