Since 1997. I became enamored with the game after watching a young Hingis doing magic with her yonex tennis racket at the US OPEN. Sampras too has his share influence, his athletic ability and shear dominance of the sport just fascinated me, his service motion won me over.
I really didn't start watching it passionately until US Open 2000 edition, one of the most exciting US opens as a whole in the past decade. I do remember watching Davenport Humiliate Hingis at the Aussie open ladies final that same year. Since then I've watched as many of the slams there after as I have been alloted. I was never a fan of ESPN, I guess I never will, they just don't respect tennis and it's one of my favorite sports if not my favorite along with volleyball.
So nineties it is.