Head of junior tennis at Les Ormes, Fisher got off to a winning start paired with Rebecca Edwards as they defeated Francesca Dubras and Katie Gouyette 6-0, 6-1.
Next up, Fisher overcame the challenge of Katie Gouyette who upset the seedings on Sunday to make the singles final after beating second seed Francesca Dubras, in three sets.
Fisher meanwhile had seen off the stubborn resistance of Sarah Jones to progress and took the opening set against Gouyette 6-3.
At 5-2 down in the second set, 16-year-old Gouyette, who will leave for the Bruguera tennis academy in Barcelona next month, broke back to 5-4 and saved numerous match points before forcing a tie break.
However, Fisher, a former circuit player who was once ranked 339 in the world, proved too strong and won the tie break to secure her second title of the day.
A long day for Fisher ended with a marathon mixed final that lasted two and half hours.
Now partnered by Jonathan Howell every point was hard fought in their match against Edwards and Matt Harris.
When Howell was broken to allow Harris to serve for the match in the final set it seemed that Fisher would be denied her clean sweep but Harris and then Edwards were broken to ensure Fisher an unblemished record.
Jeremy Cross also started with a win, taking the doubles honours with former resident Pieter Theron as they beat Guernsey’s Patrick Ogier and scratch partner Andrew Keen, from South Wales, 6-4, 6-2.
Cross then won the men’s title for the third time, adding to his 1997 and 1999 successes, beating Ogier 6-3, 6-1.
The Guernseyman had got through the tougher of the semis, defeating Jonathan Howell in a hard-hitting contest, but he was never given a chance to settle in the title decider.
The other match of the main draw was the over-35s doubles, which was an all-Jersey affair, with Grant Collins and Michael Steigenberger retaining the title after beating Mark Connelly and Ian Morgan 6-2, 7-6 (3).
Other results – Qualifiers play-offs: singles: Robert Hannah bt Sundeep Watts 6-4, 6-3.
Plate singles: Marc Gilkes bt Jeremy Miller 6-3, 4-6, 6-3; Natasha De Freitas bt Nicole Moir 6-2, 6-3; doubles: Charlie Cohen and J Miller bt Simeon Entwistle and Tom Jeggo 6-1, 6-0.