The 22-year-old Briton posted a two-stroke victory at 13-under 275, holing birdies at 16 and 17 to nail down his elusive first win.
The victory brought redemption to a tough year for Fisher -- he made only one cut in his first 19 starts before this weekend's event at Prosper Golf Resort.
Mikael Lundberg claimed second with a 3-under 69, finishing at 11-under 277, while Fabrizio Zanotti came in third at minus-9 thanks to a round of 6-under 66.
Gary Boyd, who fell in a playoff in the Czech Republic last year, stayed in the picture until logging four bogeys in a six-hole span that dropped him to an even-par 72.
Swim Week Miami Beach 2014 [PHOTOS]