Christy Connaghan stepped up with the winner, seven minutes from the end, as Letterkenny Rovers, maintained their challenge at the top of the Four Lanterns Ulster Senior League.
Fanad United 1 Letterkenny Rovers 2
Rovers remain three points adrift of leaders Cockhill, who were given a walkover 3-0 win from their game against Swilly Rovers.
Rovers took the lead in the first half when a Fanad defender put through his own goal from a Lee Toland free kick.
Six minutes into the second half, Ryan McFadden drew Fanad level when he nodded home.
However, Rovers struck the winner when Connaghan pounced after Joel Gorman drilled against a post.