Even easier, try a prelude... C major prelude from WTKbk1...I don't know of any easy fugues...hold on ill check.
EDIT:
Two fugues that are 'easier' not easy though are number 2 and 5 from WTK bk 1, C minor and D major. They are still sort of difficult, but there aren't any easy fugues, but what do you consider easy? Also fugues don't look at hard as they are, it's the intricate finger work required, with ties and stuff like that. They look pretty basic, but once you start it's tough.